Category Archives: Matching

Pedigree Collapse and DNA – Plus an Easy-Peasy Shortcut

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Pedigree collapse can be responsible for you sharing more DNA than expected with another person.

What is pedigree collapse?

Pedigree collapse occurs when you descend from the same ancestor(s) through more than one path. In other words, you descend from those ancestors through two different children. Therefore, when matching with someone else who descends through those ancestors, you may share more DNA than would be expected from that level of relationship on the surface, meaning without pedigree collapse.

Endogamy is different and means that you descend from a community of ancestors who descend from the same group of ancestors. Often out-marriage is discouraged or otherwise impossible, so all of the group of people share common ancestors, which means they often match on segments without sharing close ancestors. Examples of descent from endogamous populations are Jewish, Amish, Brethren, Acadian, Native Hawaiian, Māori, and Native American people, among others.

I wrote about the difference between pedigree collapse and endogamy in the article, What’s the Difference Between Pedigree Collapse and Endogamy?

I’ve also written about endogamy in the following articles:

Degrees of Consanguinity

If you’re a genealogist, and especially if you’ve worked with Catholic church records, you’ve probably heard of “degrees of sanguinity,” which are prohibited blood relationships in marriage. For example, siblings are prohibited from marrying because they are too closely related, according to church doctrine.

By SVG remake by WClarke based on original by User:Sg647112c – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=54804980

Today, we think of the genetic results of inbreeding, but originally, relationships (and consanguinity) also had to do with inheritance.

Essentially, marriages are prohibited by degree of sanguinity, and that degree is calculated based on this relationship chart. Prohibited degrees of consanguinity changed over time. Sometimes, a priest granted dispensation for a couple to wed who was of a prohibited degree of sanguinity. That’s a genealogy goldmine because it tells you where to look for common ancestors. It also tells you something else – that you may share more DNA with other descendants of that couple than one would otherwise expect.

More Than You Ever Expected

Recently, I’ve been working with an academic research team on a very interesting ancient DNA case that involves pedigree collapse. Doing the genealogy and genetic work on how much DNA was expected in a match without pedigree collapse, and how much was expected with pedigree collapse, was very interesting.

The team was working to confirm relationships between people in a cemetery. The burials shared more DNA than anticipated for who the people were believed to be. Enter pedigree collapse.

I can’t disclose the circumstances just yet – but I will as soon as possible. It’s an extremely interesting story.

We needed to ensure that readers, both academic and more generally understood pedigree collapse and our calculations. Why did burials share higher than expected DNA than indicated by the expected relationships? This puzzle becomes much more interesting when you add in pedigree collapse.

Academic researchers and scientists have access to models and mathematical algorithms that normal air-breathing humans don’t have easy access to.
So, what do you do if you and a match have a known pedigree collapse in your tree? How much DNA can you expect to share, and how do you calculate that?

These are all great questions, so let’s take a look.

I’m sharing the PowerPoint slides I prepared for our team on this topic. I’ve removed anything that would identify or even hint at the project and modified the slides slightly for easier consumption.

This presentation has never been given publicly, so you’re first! It seemed a waste to do this work and not share it!

Pedigree Collapse and DNA

Pedigree collapse occurs when you share an ancestor or ancestors through different pathways. In this case, the person at the bottom is the child of parents who were third cousins, but the father’s grandparents were also first cousins.

First cousin marriages were common in the not-too-distant past. Today, you could easily marry your third or fourth cousin and not even realize it unless someone in your family just happened to be a genealogist.

Genealogists use various tools to calculate the expected amount of shared DNA in relationships – first cousins, siblings, or half-siblings, for example. Both the Shared cM Project at DNAPainter and SegcM at DNA-Sci Tools provide tools.

Take a look at the article, DNA: In Search of…Full and Half-Siblings, for some great examples.

First cousins share common grandparents. Their child inherits DNA from two paths that lead back to the same ancestors. Some of that DNA will be the same, meaning the child will or can inherit the same ancestral segment from both parents, and some will be different segments from those ancestors that the parents do not share with each other.

Inheritance – How It Works

Let’s look at inheritance to see how this happens.

Let’s start with full and half-siblings.

Each child inherits half of their DNA from each parent, but not entirely the same half (unless they are identical twins.)

Therefore, full siblings will match on about 50% of their DNA, which is illustrated by the segments on the chromosome browser. However, and this will be important in a minute, about 25% of their DNA is exactly the same, when compared to each other, on the chromosome inherited from their father and mother at the same location.

On the chromosome browser, you can see that three siblings do match. One sibling (the grey background chromosomes) is the person both other full siblings are being compared to, in the example above.

What you can’t determine is whether they share the exact same DNA on both their mother and father’s Chromosome 1, where the matches overlap, for example. We know they both match their sibling, but the top person could match the sibling due to a match from their paternal chromosome in that location, and the bottom person could match due to their maternal chromosome. There’s no way to know, at least not from that view.

The areas where the siblings share exactly the same DNA on both their maternal and paternal chromosome, both, with each other are called Fully Identical REgions (FIR), as compared to Half Identical Regions (HIR) where the siblings match on either their maternal or paternal copy of the chromosome, but not both.

23andMe used to provide a tool that displayed both types of matches.

Since the data exposure incident at 23andMe, they no longer provide this lovely tool, and since that help page is now gone as well, I doubt this view will ever be returned. Fortunately, I grabbed a screenshot previously.

The dark purple segments are fully identical, meaning that these two full siblings match on both their maternal and paternal chromosomes in that location. The magenta are half identical, which means they match on EITHER the maternal or paternal chromosome in that location but not on both chromosomes. Of course, no color (light grey) means there is no match at that location.

Please note that because 23andMe counts fully identical regions (FIR) twice, their total matching cMs are elevated. The other companies do NOT count those regions twice.
GEDmatch also shows both full and half-identical regions as described more fully, here.

In this full-sibling example from GEDmatch, the green segments are fully identical regions across both the maternal and paternal chromosomes.

The definition of FIR is that two people match on both their mother’s and father’s DNA on the same chromosome. Therefore, in following generations, there technically should not be FIR matches, but in some instances we do find FIR matches outside of full siblings.

Moving down another generation, first cousins may share SOME fully identical DNA, especially if they are from an endogamous population or their mothers are related, but less, and it’s generally scattered.

Here’s my Mom’s GEDmatch comparison to her first cousin. The purple-legend segment shows a match, and the green within that match shows fully identical locations.

You can easily see that these are very scattered, probably representing “chance” or population-based fully identical matching locations within a segment. Comparatively, the green FIR segments for full siblings are dense and compact, indicating a segment that is fully identical.

Evaluating matches for dense FIR segments (known as runs of homozygosity – ROH) is a good indicator of parental relatedness.

Double Cousins

Of course, if these people were double first cousins, where the wives of the siblings were sisters to each other – the first cousins would have large patches of dense green FIR segments.

First cousins share grandparents.

Double first cousins occur when two people share both sets of grandparents, meaning that brothers marry sisters. Normal first cousins share about 12.5% of their DNA, but double first cousins share about 25% of their DNA.

In this case, Sharon and Donna descend from two brothers, James and Henry, who were sons of Joseph and Jane. In this scenario, James and Henry married unrelated women, so Sharon and Donna are first cousins to each other.

Double first cousins share both sets of grandparents so they would inherit FIR from both sets of siblings.

You need to be aware of this, but for now, let’s stick with non-double relationships. You’re welcome!

DNA Inheritance

Here’s a different example of DNA inheritance between two siblings.

  1. You can see that in the first 50 cM segment, both siblings inherited the same DNA from both parents, so they match on both their mother’s and father’s chromosomes. They match on both the 50 cM green and 50 cM pink segments. 23andMe would count that as 100 cMs, but other vendors only count a segment IF it matches, NOT if it matches twice. So, other vendors count this as a 50 cM match.
  2. In column two, these two people don’t match at all because they inherited different DNA from each parent. In this example, Person 1 inherited their maternal grandmother’s segment, and Person 2 inherited their maternal grandfather’s segment.
  3. In column three, our siblings match on their paternal grandmother’s segment.
  4. In column four, no match again.

How much can we expect to inherit at different levels – on average?

Different tools differ slightly, and all tools provide ranges. In our example, I’ve labeled the generations and how much shared DNA we would expect – WITHOUT pedigree collapse.

Ancestral couple Inherited cM Inherited %
Gen 1 – Their children 3500 cM 50
Gen 2 – Grandchildren 1750 cM 25
Gen 3 – Great-Grandchildren 875 cM 12.5
Gen 4 – GG-Grandchildren 437.5 6.25
Gen 5 – GGG-Grandchildren 218.75 3.125
Gen 6 – GGGG-Grandchildren 109.375 1.5625
Gen 7 – GGGG-Grandchildren 54.6875 .078125

Please note that this is inherited DNA, not shared (matching) DNA with another person.

Adding in pedigree collapse, you can see that we have three Gen 1 people involved, three Gen 2 descendants, and two Gen 3 and Gen 4 people.

Each of those people inherit and pass on segments from our original couple at the top.
We have three distinct inheritance paths leading from our original couple to Gen 5.
We have a first cousin marriage at Gen 2, at left, which means that their child, Gen 3, will have an elevated amount of the DNA of their common ancestors.

In Gen 4, two people marry who both descend from a common couple, meaning their child, Gen 5, descends from that couple in three different ways.

Did your eyes just glaze over? Well, mine did, too, which is why I had to draw all of this out on paper before putting it into PowerPoint.

The Gen 5 child inherits DNA from the ancestral couple via three pathways.
The next thing to keep in mind is that just because you inherit the DNA from an ancestor does not mean you match another descendant. Inheritance is not matching.

You must inherit before you can match, but just because you and someone else have inherited a DNA segment from a common ancestor does not guarantee a match. Those segments could be in different locations.

Categories of DNA

When dealing with inheritance and descent, we discuss four categories of DNA.

  • In the first generation, full siblings will, in about 25% of their locations, share the same DNA that has been inherited from both parents on the same chromosome. In other words, they match each other both maternally and paternally at that location. Those are FIR.
  • The DNA you inherit from an ancestor.
  • The DNA that both you and your cousin(s) inherit from a common ancestor and match on the same location. This is shared DNA.
  • The DNA that both you and your cousin(s) inherit from a common ancestor, but it’s not in the same location, so you do not match each other on that segment. Just because you inherit DNA from that ancestor does not necessarily mean that your cousin has the same DNA from that ancestor. This is inherited but not shared.

Inheritance is Not The Same as Matching

Inheritance is not the same thing as matching.

Inheriting our ancestor’s DNA isn’t enough. We need to match someone else who inherited that same segment in order to attribute the segment to that specific ancestor.

Depending on how close or distant the relationship, two people may share a lot of DNA (like full siblings), or one segment in more distant matches, or sometimes none at all. As we reach further back in time, we inherit less and less of our increasingly distant ancestors’ DNA, which means we match increasingly fewer of their descendants. I wrote about determining ancestral percentages in the article,  Ancestral Percentages – How Much of Them is in You?

Based on how much DNA we share with other known relatives, we can estimate relationships.

Pedigree collapse, where one descends from common ancestors more than once, increases the expected amount of inherited DNA, which in turn increases the probability of a shared match with other descendants.

Ancestral Couple Matching Between Shared DNA ~cM Shared DNA ~% Range (Shared cM Project) FIR – Identical DNA
Generation 1 Full Siblings 2600 50 1613-3488 25%
Generation 2 First Cousins 866 12.5 396-1397 0
Generation 3 Second Cousins 229 3.125 41-592 0
Generation 4 Third Cousins 73 0.78125 0-234 0

Here’s an example through third cousins, including expected FIR, fully identical regions where full siblings match each other on both their maternal and paternal chromosomes in the same location.

I provided a larger summary chart incorporating the information from public sources, here, minus FIR.

Of course, double cousins, where two pairs of siblings marry each other, represent another separate level of complexity. DNA-Sci’s Double Cousin Orogen explains this here and also provides a tool.

Double cousins, meaning when two pairs of siblings marry each other, are different from doubly related.

Doubly related means that two people descend from common ancestors through multiple paths, meaning multiple lines of descent. Doubly related is pedigree collapse. Double cousins is pedigree collapse on steroids.

Pedigree Collapse, aka Doubly Related

Calculating expected inherited DNA from multiple lines of descent is a bit more challenging.

A handy-dandy chart isn’t going to help with multiple relationships because the amount of expected shared DNA is based on the number of and distance of relationships.

Please note that this discussion excludes X-DNA matching which has its own inheritance path.

It’s time for math – but I promise I’ll make this relatively easy – pardon the pun.

What’s Behind the Math?

So, here’s the deal. I want you to understand why and how this works. You may not need this information today, but eventually, you probably will. This is one of those “refer back to it” articles for your personal library. Read this once as a conceptual overview, then read it again if you need to work through the relationships.

This is easy if you take it one step at a time.

First, we calculate each path separately.

In the first generation, full siblings inherit identical (FIR) DNA on both their mother’s and father’s chromosomes.

In the second generation, the male inherits the maternal segment, and the female inherits the paternal segment.

In the third generation, their child inherits those segments intact from both of their parents. The child inherits from the ancestral couple twice – once through each parent.

In generation 1, those two segments were FIR, fully identical regions. Both of those men married unrelated wives. When their children, Gen 2, were born, they had either the maternal or paternal segment from their father because they had an entirely different segment in that location from their mother.

However, the child in Gen 3 inherited the original green segment from their father and the original pink segment from their mother – reuniting those FIR segments in later generations.

First Cousin’s Child

Let’s calculate the inheritance for the child of those two first cousins who married.

Ancestral couple Inherited cM Inherited %
Gen 3 – Great-Grandchildren 875 cM 12.5
Gen 3 – Great-Grandchildren 875 cM 12.5
Total 1750 cM 25

Normally, a Gen 3 person inherits roughly 875 cM, or 12.5% of their great-grandparent’s DNA. However, since their grandparents were first cousins, they inherit about twice that amount, or 1750 cM.

While a Gen 3 person inherits as much as a grandchild (25%) normally would from the original couple, they won’t match on all of that DNA. When matching, we need to subtract some of that DNA out of the equation for two reasons:

  • In the first generation, between siblings, some of their DNA was fully identical and cannot be identified as such.
  • In the second generation, they will each have some parts of the ancestral couple’s DNA that will not match the other person. So, they inherit the same amounts from their common ancestors, but they can only be expected to match on about 25% of that amount two generations later.

However, the child of first cousins who marry inherits more DNA of the common ancestors than they would if their parents weren’t related. It’s just that some of that DNA is the same, potentially on the maternal and paternal chromosomes again, and some won’t match at all.

While matching DNA is the whole point of autosomal DNA testing, fully identical DNA matching regions (FIR) cannot be identified that way. For the most part, other than identifying full and half-siblings, sometimes pedigree collapse, and parent-relatedness, fully identical DNA isn’t terribly useful for genealogy. However, we still need to understand how this works.

It’s OK if you just want to say, “I know we’ll share more DNA due to pedigree collapse,” but if you want to know how much more to expect, keep reading. I’d really like for you to understand use cases and be able to track those segments.

Remember, we will learn a super-easy shortcut at the end, so for now, just read. It’s important to understand why the shortcut works.

Sibling Inheritance Versus Matching

In order to compare apples to apples, sometimes we need to remove some portion of DNA in our calculations.

Remember story problems where you had to “show your work”?

Calculating Expected DNA

Here’s the step-by-step logic.

Ancestral couple Inherited Non-Identical cM Inherited %
Gen 1 first son 3500 50
Gen 1 second son 3500 50
Less identical segments (FIR) -1750 (subtracted from one child for illustration) 25
Gen 2 son 1750 25
Gen 2 daughter married Gen 2 son 875 12.5
Gen 3 – Their child path through Gen 2 son 875 cM 12.5
Gen 3 – Their child path through Gen 2 mother 437.5 cM 6.25
Their child total without removing identical segments 1750 cM 25
Their child total after removing identical segments 1312.5 18.75

Category cMs Most Probable Degree Relationship
No Pedigree Collapse 875 98% Great grandparent or great-grandchild, great or half aunt/uncle, great or half niece/nephew, 1C 3
Pedigree Collapse without identical segment removal 1750 100% Grandparent, grandchild, aunt/uncle, half-sibling, niece/nephew 2
Pedigree Collapse after identical segment removal 1312.5 56% grandparent, grandchild, aunt/uncle, niece/nephew, half-sibling 2

Just because you HAVE this much shared (and/or identical) DNA doesn’t mean you’ll match on that DNA.

Next, let’s look at Gen 5 child who inherited three ways from the ancestors.

If you think, “This will never happen,” remember that it did, which is why I was working through this story problem. It’s not uncommon for families to live in the same area for generations. You married who you saw – generally, your family and neighbors, who were likely also family.

Let’s take a look at that 5th generation child.

The more distantly related, the less pedigree collapse affects matching DNA. That’s not to say we can ignore it.

Here’s our work product. See, this isn’t difficult when you take it step by step, one at a time.

Ancestral couple Inherited Non-Identical cM Inherited %
Gen 3 Child total after removing identical segments 1312.5 18.75
Gen 4 father – half of Gen 3 father 656.25 9.375
Gen 5 child – half of Gen 4 father 328.125 4.6875
Gen 5 child – mother’s side calculated from ancestral couple normally 218.75 3.125
Total for Gen 5 Child 546.875 7.8125

Inheritance Ranges

Lots of factors can affect how much DNA a person in any given generation inherits from an ancestor. The same is true with multiple paths from that same ancestor. How do we calculate multiple path inheritance ranges?

As with any relationship, we find a range, or combined set of ranges for Gen 5 Child based on the multiple pathways back to the common ancestors.

Gen 5 Child Inherited Non-Identical cM Inherited %
Without removing either paternal or maternal identical cMs 656.25 9.375
After removing paternal identical cMs only 546.875 7.8125

 
After removing maternal cMs only 546.875 7.8125

 
After removing both paternal and maternal identical cMs 362.50 6.25
Normal Gen 5 no pedigree collapse 218 3.125

What About Matching?

Inheritance and matching are different. Most of the time, two people are unlikely to share all of the DNA they inherited from a particular ancestor. Of course, inheriting through multiple paths increases the likelihood that at least some DNA from that ancestor is preserved and that it’s shared with other descendants.

Two people aren’t expected to match on all of the segments of DNA that they inherit from a particular ancestor. The closer in time the relationship, the more segments they will inherit from that ancestor, which increases the chances of matching on at least one or some segments.

Clearly, pedigree collapse affects matching. It’s most pronounced in closer relationships, but it may also be the only thing that has preserved that ONE matching segment in a more distant relationship.

So, how does pedigree collapse actually affect the likelihood of matching? What can we actually expect to see? Is there a name for this and a mathematical model to assist with calculations?

I’m so glad you asked! It’s called Coefficient of Relationship.

Coefficent of Relationship

My colleague, Diahan Southard, a scientist who writes at YourDNAGuide has authored two wonderful articles about calculating the statistical effects of pedigree collapse.

You can also read another article about the methodology of calculating coefficient of relationship, here, on WaybackMachine.

Diahan is a math whiz. I’m not, so I needed to devise something “quick and dirty” for my own personal use. I promised you a “cheat sheet,” so here’s the methodology.

Two Inheritance Paths – First and Third Cousins

Let’s look at an example where two people are both first cousins and third cousins because their grandparents were also first cousins.

Let’s calculate how these two people are related. They are first cousins and also third cousins.

When calculating the effects of pedigree collapse, we calculate the first relationship normally, then calculate the second relationship and add a portion of the result.

Here’s the math.

Using the Shared cM Project for the expected amount of shared DNA for both relationships, we’ve calculated the expected range for this pedigree collapse relationship.

Tying this back to degrees of relatedness.

Let’s look at ways to do Quick Calculations using the publicly available Shared cM charts and my composite tables, here.

Using Average Shared DNA

This first methodology uses average expected amount of shared, meaning matching, DNA. Please note, I’m not necessarily expecting you to DO this now, just read to follow.

Using Average Inherited DNA

Here’s a second method using average inherited DNA, meaning people wouldn’t be expected to match on all of the inherited DNA – just a portion.

You can’t always use the shared cM charts because all relationships aren’t represented, so you may need to use the amount of expected inherited DNA instead of shared DNA amounts.

Methodology Differences

Remember, none of these methodologies are foolproof because DNA inheritance is random. You may also have additional relationships that you’re aware of.

So, what’s the easiest method? Neither, actually. I’ve found an even easier method based on these proven methodologies.

Easy-Peasy Pedigree Collapse Shortcut Range Calculation in 4 Steps

Now that you understand the science and reasoning behind all of this, you can choose from multiple calculation methodologies after drawing a picture of the relevant tree.

You’re probably wondering, “What’s the easiest way to do this?”

  • These quick calculation methods are the easiest to work with for non-scientists and non-math whizzes. These are the calculations I use because, taking into account random recombination, you can’t do any better than get close.
  • Also, remember, if you’re dealing with double relationships, meaning double first cousins, you’ll need to take that into consideration, too.
  • If endogamy is involved, your matches will be higher yet, and you should use the highest calculations below because you need to be on the highest end of the range – and that may still not be high enough.

In these Easy-Peasy calculations, you calculate for the lowest, then the highest, and that’s your range. Please note that these are options, and truly, one size does not fit all.

  1. For the lowest end of the range, simply use the average of the highest relationship. In this case, that would be 1C, which is 866 cM. Remember that you may not share DNA with third cousins. 10% of third cousins don’t share any DNA, and 50% of fourth cousins don’t.
  2. For the highest end of the range, find the second relationship in the Shared cM chart, divide the average by half, and add to the value from the closest relationship. In this case, half of the 3C value of 76 is 38.
  3. Add 38 to 866 for the highest end of the range of 904.
  4. If there’s yet another path to ANY shared ancestor, add half that amount too to calculate the high end of the range – unless it’s 4C or more distant, then don’t add anything.

You can see that this easy-peasy range calculation for pedigree collapse compares very well to the more complex but still easy calculations.

  • Easy-peasy calculation: 866-904
  • Other calculation methods: 850-903
  • For this same relationship combination, Diahan’s statistical calculation was 850 cM.

Back to Genealogy

What’s the short story about how pedigree collapse affects genealogy?

Essentially, in close generations, meaning within a few generations of two first cousins marrying, descendants can expect to inherit and share significantly more DNA of the common ancestors, but not double the amount. As we move further away from those marriages in time, the effect becomes less pronounced and more difficult to detect. You can see that effect when calculating multiple paths where at the fourth cousin level, or more distant, those cousins have a 50% or greater possibility of not sharing DNA segments.

Of course, with multiple paths to the same ancestor, your chances of inheriting at least some segments from the common ancestor are increased because their DNA descends through multiple paths.

Today, close marriages are much less common and have been for several generations in many cultures, so we see fewer instances where pedigree collapse makes a significant difference.

Within a population or group of people, if pedigree collapse becomes common, meaning that there are multiple paths leading back to common ancestors, like our three-path example, DNA segments from the common ancestors are found among many people. Significant pedigree collapse becomes endogamy, especially if marriage outside of the group is difficult, impossible, or discouraged.

Normally, pedigree collapse is not recorded in actual records. It’s left to genealogists to discover those connections.

The exception, of course, is those wonderful Catholic parish records where the priest granted dispensations. Sometimes, that’s our only hint to earlier genealogy. In the case of the marriage of Marie-Josesphe LePrince to Jacques Forest, the priest wrote “dispense 3-3 consanguinity,” which tells us that they shared great-grandparents. It also tells us that their grandparents were siblings, that the bride and groom were second cousins, and that their children and descendants inherited an extra dose of DNA from their common great-grandparents.

How does that affect me today? Given that I’m their seventh-generation descendant – probably not at all. Of course, they are Acadian, and the Acadians are highly endogamous, which means I match many Acadians because all Acadians share the DNA of just a few founders, making it almost impossible to track segments to any particular ancestor. If it weren’t for endogamy, I would probably match few, if any, of their descendants.

Now, when you see those Catholic church dispensations or otherwise discover pedigree collapse, you can be really excited, because you understand the effects of pedigree collapse and how to calculate resulting matches! You might, just might, have retained a DNA segment from those ancestors because you inherited segments through multiple paths – increasing the probability that one survived.

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Bennett Greenspan: Meet My Extended Family & Discover Extraordinary Deep Heritage

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“My ancestors are in my soul. I can’t get them out of my mind.”

Bennett Greenspan

“And yes, I brake for cemeteries.”

Bennett Greenspan gave an incredibly interesting presentation at the 15th International Genetic Genealogy Conference held by FamilyTreeDNA in November 2023. Since his retirement in January 2021, he has been able to focus on his genealogy. Once a genealogist, always a genealogist.

Bennett said some things I hadn’t thought about, and now I’m viewing Y-DNA matches with a different perspective – based on how he’s using his results.

Ever since I met him, Bennett’s focus has been to use genetics to unravel his complex Jewish heritage.

The questions that drive Bennett are the same ones that motivate most genealogists:

  1. Who are we?
  2. Where did we come from?
  3. Where were we before we were there?
  4. How did my ancestors get there?

Bennett “lost his family lines” before the mid-1800s due to his Jewish heritage, exacerbated in the 1930s by the devastation wrought by the Holocaust. Families were either killed or scattered to survive. It has been through Y-DNA in particular that he has been able to establish unquestionable and confirmed connections with other Greenspan men, sometimes by similar but different surnames, like Green, and sometimes with other surnames entirely.

When Bennett first started down this path, he tested more than 62 men before actually finding one a decade later that matched his Y-DNA. Bennet commented that it was “a little frustrating.”

Persistence is the key, and sometimes, genealogy is a waiting game, but that’s small comfort to genealogists during that unproductive waiting period.

Eventually, Bennett reassembled his family, at least somewhat, but it was a long journey. Here’s Bennett’s incredible story, including surprises, as he tells it.

Bennett discovered genealogy at age 12 and, like many genealogists, created a pedigree chart by talking to his family.

I love the mark-outs. How many of us still have our first chart with its edits?

This is the young Bennett Greenspan, whose interest in genealogy would one day unlock secrets for all of us!

It was a long way from a decade with no matches to finding his genetic kin in Ukraine.

The Big Y-700 Time Tree shows Bennett’s lineage in Ukraine, but stepping back in time, some descendants of his ancestors are found in adjacent locations.

Bennett was passionately discussing his matches on the time tree and in the Greenspan project, so I visited the Greenspan DNA Project, where the earliest known ancestors of Bennett’s Big Y matches are shown on the Group Time Tree.

Bennett’s closest matches are shown as descendants of haplogroup J-ZS1718. He has additional matches who are not in the Greenspan project. Since this is the Group Time Tree, it only displays the people in that project, along with their earliest known ancestors, Isaac and Usher Greenspan.

12-Marker Matches

Bennett never fails to amaze me. He said something very important and profound about 12-marker matches that I really hadn’t thought about – at least not this way.

As a community, we are often guilty of discounting 12-marker matches, those that don’t match us at 25-markers or above, or with different surnames, as “too far back in time” or otherwise irrelevant. I always look at the names and earliest known ancestors of 12-marker matches, because that person may have tested back in the day when fewer markers were available. But if I don’t recognize something, I move on.

However, Bennett said that, ”Y-12 matches reach back to a common ancestor. 12-marker matches are not a quirk. They are related to you, just further back in time. You share a common ancestor with them, someplace. They may be more distant, but they are still your close matches.”

I’ve been in too much of a hurry for a quick win, and ignoring the (apparently not so) obvious.

Determining when and where their ancestors lived also paves the way to discover yours. Your Y-DNA and theirs were in the same place at the same time.

Of Bennett’s 171 12-marker matches, 107 have upgraded to the Big Y, probably mostly due to his encouragement. This benefits both them and Bennett by fleshing out the history of that entire group of men, including how they got to where they are found in the first available records. The Time Tree shows when Big Y testers shared a common ancestor, and based on Earliest Known Ancestor (EKA) locations, where. This provides further information about the lives of ancestors before contemporary records – in other words – people that we can never identify by name. It’s a window into ancestors before surnames.

Bennett notes that testers need to know their ancestral village or location to be most useful within the project, and of course, they need to enter their EKA information. Location information is how the Migration Map, Matches Map, and Discover tools, including the Time Tree, are built.

What Happened in Spain?

Bennett’s ancestors and those of his 12-marker matches are found in Spain, and as Bennett says, “One son stayed and one left about the year 296.”

While we have no idea of their names, based on the Time Tree combined with the cluster of earliest known ancestors, we know that they were in Spain, and when.

Their family story is revealed in the bifurcation of the tree found beneath haplogroup J-L823, formed about 296 CE. One line stayed in Spain, and Bennett’s line migrated to eastern Europe where that man’s descendants, including Bennett’s family, are found in the Russian Federation, Belarus, Poland, Lithuania, Sweden, Slovakia, Ukraine, Germany, Romania, the Czech Republic, and other eastern European locations. The closer to you in the tree and in time, the more relevant to your more recent ancestral story.

However, Bennett’s deeper ancestry, the migration of his ancestors to Spain, was only revealed by testing those more distantly related men. Those same men could well have been ignored entirely because they only matched at 12 markers.

According to Bennett, “Y-12 markers are important because these are the men most closely related to you in a database of 1 million men.”

How incredibly profound. How much have I been cavalierly overlooking?

How does this actually apply to Bennett’s results?

Bennett’s Spanish Matches

Bennett has the following STR panel matches who indicate that their EKA are from Spain. You can see that they match Bennett on a variety of panels.

  • X = yes, match
  • No = no match
  • Blank = not tested at that level.

In the Big Y GD column, the genetic distance (GD) is displayed as 15/660 where 15 is the number of mismatches, or the cumulative genetic distance ABOVE the 111 panel, and 660 is the number of STR markers above 111 with results.

The Big Y-500 test guaranteed a minimum of 500 total STR markers, and the Big Y-700 guarantees a minimum of 700 total STR markers, plus multiple scans of the balance of the Y chromosome for SNP mutations that define haplogroups. Testers don’t receive the same number of markers because the scan technology sometimes doesn’t read a specific location.

Tester 12 25 37 67 111 Big Y Test Big Y GD Big Y Match Haplogroup
AA X X X No No Yes 15/660 No J-FTD8826
DT X X No No X Yes 17/664 No J-FTE50318
JG X X No No
AR No No X X No No
ELR X X X No No
EL X X Yes 17/666 No J-FTE50318
GC X X X X No No
JC X No No
JLG X X No No No Yes 14/662 No J-FTE23540
MF X X No X No Yes 15/665 No J-FTD91126
MT X X X X No No
BE X X X X X Yes 20/664 No J-BY1795
DR X X X X X Yes 16/660 No J-FTC87344
EC X X X X X Yes 15/665 No J-FTC87344
GM X X No No No Yes 16/650 No J-FTD28153
GM X X X X No Yes 17/664 No J-FTD11019
LS X X No No No Yes 18/666 No J-FTD28153
NE X X X X X Yes 23/597 No J-BY1795
NC X No No
RR X X X No X Yes 22/659 No J-BY1795
TT X X X X X Yes 16/647 No J-FTC87344
XG X X X No No Yes 17/523 No J-BY167283
JA X X No No No Yes 15/646 No J-FTD11019

Of those 23 Spanish matches, sixteen have upgraded to Big Y tests, 14 of which are Big Y-700s, resulting in nine different haplogroups, all of which are descendants of Haplogroup J-L823. How cool is that?

The “Nos” in the Big Y Match Column aren’t mistakes. That’s right – none of these men match Bennett on the Big Y test, meaning they had more than a 30 mutation difference between them and Bennett on the Big Y test.

At first glance, you’d think that Bennett would have been disappointed, but that’s not the case at all! In fact, it was the information provided by these distant Spanish matches that provided Bennett with the information that his line had split sometime around the year 296 CE, with one branch remaining in Spain and his branch migrating to Eastern Europe, where he has lots of matches.

DNA Plus History

What was happening in Spain or the Iberian peninsula that involved the Jewish people about that time? Historical records exist of Jews living in that region before the fall of the Second Temple in about 70 CE, including records of Jews being expelled from Rome in 139 for their “corrupting influence.”

Furthermore, the Ancient DNA Connections for haplogroup J-L823, the most recent common ancestor (MRCA) for all of those branches, includes connections to multiple burials from:

  • Lebanon
  • Iran
  • Rome (from 1-400 CE)
  • Turkey
  • Jordan

Clearly, Bennett’s ancestor was in the Iberian peninsula around or before 296 CE. One branch stayed, winding up in Spain, and one headed for Europe.

Without these matches, some who didn’t match above the 12 or 25 marker level, how would Bennett have EVER known that his Jewish ancestors left the Middle East for Spain in the early years? How would he have known they migrated from Spain to Eastern Europe, and how would he have known that his line did not migrate directly from the Levant to Eastern Europe in the 9th century?

Big Y matches are typically within about 1500 years, but non-matches are still INCREDIBLY valuable. Without them, you can’t completely assemble your family story.

I noticed on the Time Tree that in Bennett’s Eastern European line, one of his ancestor’s brother lineages includes the Katzenellenbogen Rabbinic Lineage derived from ancient DNA samples.

Bennett’s successes have resulted from contacting his matches and encouraging upgrades. So how did he do it? What’s the magic sauce?

Contacting Matches

How to contact matches successfully is a question I see often. In fact, FamilyTreeDNA recently wrote about that in an article, here.

Bennett’s methodology for contacting his matches to encourage an upgrade is that he sends an email explaining why he’s encouraging them to upgrade, followed by a 2nd email three days later.

Bennett tells the recipient that we are at an inflection point in time. “It’s winter, the wind is blowing hard, and many of the leaves are gone.”

In other words, we need to cast the net wider and capture what we can, while we can. Unfortunately, many early testers have died, and with them, chapters of history are perishing.

Collaboration is key. In addition to encouraging upgrades, Bennett also offers Zoom calls to these groups of men to explain the results if they are interested.

What a GREAT idea! I need to begin offering that as well.

Upgrade Request

Bennett reaches out to his matches at various levels, but he expects his closer STR matches, meaning at the 67 and 111 marker level with the fewest mismatches, to match him on a Big Y-700 test and connect someplace between 300-600 years ago, which helps everyone flesh out their tree.

Bennett’s email:

Hello <name>,

Since you have already made a sizable investment in your Y-DNA, you now know that we come from the dominant male Middle Eastern group (Haplogroup J) of men who <subject here>.

What’s really neat is that our Y-DNA has recently been found in an archaeological site in Northwestern Jordan dated to about 4200 years ago. I know this because I upgraded to the Big Y, which tests SNPs, looking at several million locations on the Y chromosome of each man.

One academic customer recently compared this new technology as the difference between looking into space with binoculars versus the Hubble Telescope.

I don’t know if you are familiar with your list of matches at the highest level you’ve tested for, either Y-67 or Y-111. If you are, you should recognize my name and the names of others who have taken the Big Y test.

You’ll see what you’ll gain by letting me upgrade your test for you and determining whether you are related to my line – probably between about 200 years and 500 years.

This might be the second time that I have written to you on this matter; can I presume if I don’t hear from you that you’re not really interested in the Y-DNA subject anymore?

Can I run the test so that I can see how closely we are related – at my expense? (Of course, you get to see how closely related we are, too).

Please reply to me and say “yes.” You don’t even have to put a 🙂 if you don’t want to.

I started this company and this industry over 20 years ago. I predict that you will be happy with the history of YOU that this upgrade will uncover.

Best,

Bennett Greenspan

As you can see, this email can easily be personalized further and adapted to matches at the 37, 25, and 12 marker levels – or even Family Finder matches, now that intermediate-range haplogroups are being reported.

What’s Next?

I’m going back to every one of the kits I sponsored or that represent descendants of one of my ancestors to review their matches again – focusing not just on the closest matches with common surnames, but also on locations – and specifically at lower matching levels. I’ll also be checking their Family Finder matches for male surname matches, or similar surnames.

As is evident from Bennett’s tests, an entire mine of diamonds is out there, just waiting to be unearthed by a Big Y test.

And to think that some people have been advising people to ignore 12-marker matches out-of-hand because they are “entirely irrelevant.” They aren’t – for two reasons.

  1. First, some early testers only tested to that level
  2. Second, because of the deeper history that Big Y tests from those matches will uncover

You can view your Y-DNA matches, upgrade your own Y-DNA test, or order a Big Y-700 test if you haven’t yet tested by clicking here. What’s your next step?

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FamilyTreeDNA 2023 Update – Past, Present and Future

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At the FamilyTreeDNA International Conference on Genetic Genealogy, held November 3-5 in Houston for group project administrators, product and feature updates were scattered across both days in various presentations.

I’ve combined the updates from FamilyTreeDNA into one article.

I’ve already written two articles that pertain to the conference.

FamilyTreeDNA has already begun rolling the new Y DNA haplogroups from Family Finder autosomal tests, which I wrote about here:

I still have at least two more articles to publish from this conference that was chocked full of wonderful information from a wide range of talented speakers.

Past, Present, and Future with Katy Rowe-Schurwanz

Katy Rowe-Schurwanz, FamilyTreeDNA’s Product Manager, provided an update on what has been accomplished in the four and a half years since the last conference, what’s underway now, and her wish list for 2024.

Please note the word “wish list.” Wish list items are NOT commitments.

Recent Milestones

A lot has been happening at FamilyTreeDNA since the last conference.

Acquisition and Wellness Bundles

As everyone is aware, at the end of 2020, myDNA acquired Gene by Gene, the parent company of FamilyTreeDNA, which included the lab. As a result, the FamilyTreeDNA product menu has expanded, and wellness bundles are now available for FamilyTreeDNA customers.

If you’re interested, you can order the Wellness product in a bundle with a Family Finder test, here.

You can add the Wellness product for $39 if you’ve already tested.

New TIP (Time Prediction) STR Report

Did you notice that the old TIP report for Y DNA STR markers was replaced with an updated version several months ago?

To view the new report, sign on and select your Y DNA matches. At the far right of each match you’ll see these three icons representing a pedigree chart, notes, and the TIP (Time Predictor) report.

The updated TIP report includes wonderful new graphs and age estimates for each match category, which you can read about, here. Each category, such as 67-marker matches, has time estimates in which a common ancestor might have lived at each possible genetic distance.

Math is our friend, and thankfully, someone else has done it for us!

Please note that the Big Y SNP dates are MUCH more accurate for a variety of reasons, not limited to the instability and rapid mutation rate of STR mutations.

MyOrigins3

MyOrigins3, FamilyTreeDNA’s ethnicity offering, added over 60 new reference populations for a total of 90, plus chromosome painting. You can read about MyOrigins features here, and the white paper, here.

This is one of my favorite improvements because it allows me to identify the segment location of my population ancestries, which in turn allows me to identify people who share my minority segments such as Native American and African.

Due to a lack of records, these relationships are often exceedingly difficult to identify, and MyOrigins3 helps immensely.

Additional Releases

Additional products and features released since the last conference include:

Discover

Released in July 2022, Discover is the amazing new free product that details your ancestor’s Y DNA “story” and his walk through time and across the globe.

In the past 18 months, all of the Discover features are new, so I’m only making a brief list here. The great thing is that everyone can use Discover if you know or can discover (pardon the pun) the haplogroup of your ancestral lines. Surname projects are often beneficial for finding your lineages.

  • Haplogroup Story includes haplogroup location, ages derived from the earliest known ancestor (EKA) of your matches, and ancient DNA samples. Please be sure you’ve entered or updated your EKA, and that the information is current. You can find instructions for how to update or add your EKA here.
  • A recent addition to the haplogroup story includes Haplogroup Badges.
  • Country Frequency showing where this haplogroup is found with either a table view or an interactive map
  • Famous and infamous Notable Connections, including Mayflower passengers, Patriots from the American Revolution, US presidents, royal houses, artists, musicians, authors, pirates, sports figures, scientists, and more.

If you know of a proven connection to a notable figure, contact customer support and let them know! Notable connections are added every week.

One famous Discover connection is Ludwig von Beethoven which resulted from a joint academic study between FamilyTreeDNA and academic researchers. It’s quite a story and includes both a mystery and misattributed parentage. You can see if you match on Discover and read about the study, here.

  • Updated Migration Map, including locations of select ancient DNA sites
  • The Time Tree, probably the most popular Discover report, shows the most current version of the Y DNA phylotree, updated weekly, plus scientifically calculated ages for each branch. Tree node locations are determined by your matches and their EKA countries of origin. I wrote about the Time Tree, here.
  • Anticipated in early 2024, the EKA and block tree matches will also be shown on the Time Tree in Discover for individual Big Y testers, meaning they will need to sign in through their kits.
  • The Group Time Tree, visible through group projects, takes the Time Tree a step further by including the names of the EKA of each person on the Time Tree within a specific project. Information is only displayed for project members who have given permission to include their data. You can select specific project groupings to view, or the entire project. I wrote about the Group Time Tree here and here.
  • Globetrekker is an exclusive Big Y mapping feature discussed here, here, here, and here.
  • Ancient Connections includes more than 6,100 ancient Y DNA results from across the globe, which have been individually analyzed and added for matching in Discover. Ancient Connections serve to anchor haplogroups and provide important clues about matches, migration paths and culture. New connections are added weekly or as academic papers with adequate Y DNA coverage are released.
  • Your Ancestral Path, which lists the haplogroups through every step from the tester back to Y Adam and beyond. Additional information for each haplogroup in your path includes “Time Passed” between haplogroups, and “Immediate Descendants,” meaning haplogroups that descend from each subclade. New columns recently added include “Tested Modern Descendants” and “Ancient Connections.”
  • Suggested Projects include surname, haplogroup, and geographic projects. Katy said that people joining projects are more likely to collaborate and upgrade their tests. You can also see which projects other men with this haplogroup have joined, which may well be projects you want to join too.
  • Scientific Details provides additional information, such as each branch’s confidence intervals and equivalent variables (SNPs). You can read more here.
  • Compare Haplogroups is the most recent new feature, added just last month, which allows you to enter any two haplogroups and compare them to determine their most recent common ancestral haplogroup. You can read about Compare Haplogroups, here.

Please note that the Studies feature is coming soon, providing information about studies whose data has been included in Discover.

You can read about Discover here, here, here, and here.

If you’re interested, FamilyTreeDNA has released a one-minute introduction to Y DNA and Discover that would interest new testers, here.

Earliest Known Ancestor (EKA) Improvement

Another improvement is that the earliest known ancestor is MUCH easier to enter now, and the process has been simplified. The EKAs are critical for Discover, so PLEASE be sure you’ve entered and updated your EKA.

Under the dropdown beside your name in the upper right-hand corner of your personal page, select Account Settings, then Genealogy and Earliest Known Ancestors. Complete the information, then click on “Update Location” to find or enter the location on a map to record the coordinates.

It’s easy. Just type or drop a pin and “Save.”

Saving will take you back to the original EKA page. Save that page, too.

Recommended Projects on Haplogroups & SNPs Page

You’re probably aware that Discover suggests projects for Y DNA testers to join, but recommended haplogroup projects are available on each tester’s pages, under the Y DNA Haplotree & SNPs page, in the Y DNA STR results section.

If there isn’t a project for your immediate haplogroup, just scroll up to find the closest upstream project. You can also view this page by Variants, Surnames and Countries.

This is a super easy tool to use to view which surnames are clustered with and upstream of your haplogroup. With Family Finder haplogroups being assigned now, I check my upstream haplogroups almost daily to see what has been added.

For example, my Big Y Estes results are ten branches below R-DF49, but several men, including Estes testers, have been assigned at this level, thanks to Y DNA haplogroups from Family Finder testing. I can now look for these haplogroups in the STR and Family Finder matches lists and see if those men are receptive to Big Y testing.

Abandoned Projects

Sometimes group project administrators can no longer function in that capacity, resulting in the project becoming abandoned. FamilyTreeDNA has implemented a feature to help remedy that situation.

If you discover an abandoned project, you can adopt the project, spruce things up, and select the new project settings. Furthermore, administrators can choose to display this message to recruit co-administrators. I need to do this for several projects where I have no co-admin.

If you are looking for help with your project, you can choose to display the button
through the Project Profile page in GAP. For non-project administrators, if you’d like to help, please email the current project administrators.

New Kit Manager Feature

FamilyTreeDNA has added a “Kit Manager” feature so that an individual can designate another person as the manager of their kit.

This new setting provides an avenue for you to designate someone else as the manager of your DNA test. This alerts FamilyTreeDNA that they can share information with both of you – essentially treating your designated kit manager the same as you.

If you’re the kit manager for someone else, you NEED to be sure this is completed. If that person is unavailable for some reason, and support needs to verify that you have legitimate access to this kit, this form and the Beneficiary form are the ONLY ways they can do that.

If your family member has simply given you their kit number and password, and for some reason, a password reset is required, and their email address is the primary contact – you may be shut out of this kit if you don’t complete this form.

Beneficiary Page

Additionally, everyone needs to be sure to complete the Beneficiary page so that in the event of your demise, FamilyTreeDNA knows who you’ve designated to access and manage your DNA account in perpetuity. If you’ve inherited a kit, you need to add a beneficiary to take over in the event of your death as well.

What is FamilyTreeDNA working on now?

Currently in the Works

Katy moved on to what’s currently underway.

Privacy and Security

Clearly, the unauthorized customer data exposure breach at 23andMe has reverberated through the entire online community, not just genetic genealogy. You can read about the incident here, here, here, and here.

FamilyTreeDNA has already taken several steps, and others are in development and will be released shortly.

Clearly, in this fast-moving situation, everything is subject to change.

Here’s what has happened and is currently planned as of today:

  • Group Project Administrators will be required to reset their password soon.

Why is this necessary?

Unauthorized access was gained to 23andMe accounts by people using the same password for multiple accounts, combined with their email as their user ID. Many people use the same password for every account so that they can remember it. That means that all a hacker needs to do is breach one account, and they can use that same information to “legitimately” sign in to other accounts. There is no way for the vendor to recognize this as unauthorized since they have both your user ID and password.

That’s exactly what happened at 23andMe. In other breaches, this information was exposed, and hackers simply tried the same username and password combination at 23andMe, exposing the entire account of the person whose account they signed in “as.” This includes all of their matches, genetic tree, shared matches, matches of matches, ethnicity, and segments. They could also have downloaded both the match list and the raw DNA file of the compromised account.

At FamilyTreeDNA, project administrators can select their own username, which could be their email, so they will be required to reset their password.

Additional precautions have been put in place on an interim basis:

  • A pause in the ability to download match and segment information.
  • A pause in accepting 23andMe uploads.

Administrators will also be required to use two-factor authentication (2FA.) To date, two of the four major vendors are requiring 2FA. I would not be surprised to see it more broadly. Facebook recently required me to implement 2FA there, too, due to the “reach” of my postings, but 2FA is not required of everyone on Facebook.

Please note that if you received an email or message that is supposedly from any vendor requiring 2FA, GO DIRECTLY TO THAT VENDOR SITE AND SIGN IN.  Never click on a link in an email you weren’t expecting. Bad actors exploit everything.

Customers who are not signing in as administrators are not required to implement 2FA, nor will they be required to reset their password.

Personally, I will implement 2FA as soon as it’s available.

While 2FA is an extra step, it’s easy to get used to, and it has already literally saved one of my friends from an authorized hack on their primary and backup email accounts this week. Another friend just lost their entire account on Facebook because someone signed in as them. Their account was gone within 15 minutes.

2FA is one of those things you don’t appreciate (at all) until it saves you, and then, suddenly, you’re incredibly grateful.

At this point in time, FamilyTreeDNA users will NOT be required to do a password reset or implement 2FA. This is because customers use a kit number for sign-in and not a username or email address. I would strongly recommend changing your password to something “not easy.” Never reuse passwords between accounts.

I really, really want you to visit this link at TechRepublic and scroll down to Figure A, which shows how long it takes a hacker to crack your password. I guarantee you, it’s MUCH quicker than you’d ever expect.

Kim Komando wrote about this topic two years ago, so compare the two charts to see how much easier this has become in just two years.

Again, if you receive an email about resetting your password, don’t click on a link. Sign in independently to the vendor’s system, but DO reset your password.

FamilyTreeDNA also engages in additional security efforts, such as ongoing penetration testing.

New Permissions

Additionally, at FamilyTreeDNA, changes were already in the works to separate out at least two permissions that testers can opt-in to without granting project administrators Advanced rights.

  • Download data
  • Purchase tests

The ability to purchase tests can be very important because it allows administrators to order and pay for tests or upgrades on behalf of this tester anytime in the future.

Family Finder Haplogroups

FamilyTreeDNA has already begun releasing mid-level Y DNA haplogroups for autosomal testers in a staggered rollout of several thousand a day.

I wrote about this in the article, FamilyTreeDNA Provides Y DNA Haplogroups from Family Finder Autosomal Tests, so I’m not repeating all of that information here – just highlights.

  • The Family Finder haplogroup rollout is being staggered and began with customers on the most recent version of the testing chip, which was implemented in March of 2019.
  • Last will be transfers/uploads from third parties.
  • Haplogroups resulting from tests performed in the FTDNA labs will be visible to matches and within projects. They will also be used in both Discover and the haplotree statistics. This includes Family Finder plus MyHeritage and Vitagene uploads.
  • Both MyHeritage and Vitagene are uploaded or “transferred” via an intracompany secure link, meaning FamilyTreeDNA knows that their information is credible and has not been manipulated.
  • Haplogroups derived from tests performed elsewhere will only be visible to the user or a group administrator viewing a kit within a project. They will not be visible to matches or used in trees or for statistics.
  • Any man who has taken a Y DNA STR test will receive a SNP-confirmed, updated haplogroup from their Family Finder test that replaces their predicted haplogroup from the STR test.

Please read this article for more information.

New Discover Tools and Updates

Discover content continues to be updated, and new features are added regularly, creating an increasingly robust user experience.

Soon, group administrators will be able to view all Discover features (like Globetrekker) when viewing kits of project members who have granted an appropriate level of access.

Ancient and Notable connects are added weekly, and a new feature, Study Connections, will be added shortly.

Study Connections is a feature requested by customers that will show you which study your academic matches came from. Today, those results are used in the Y DNA tree, but the source is not detailed.

Anticipated in early 2024, the EKA and block tree matches will also be shown on the Time Tree in Discover for individual Big Y testers (not publicly).

Big Y FaceBook Group

FamilyTreeDNA has ramped up its social media presence. They launched the Big Y Facebook group in July 2023, here, which currently has just under 9000 members. Several project administrators have volunteered their time to help manage the group.

FamilyTreeDNA Blog

In addition, FamilyTreeDNA is publishing at least one blog article each week, and sometimes more. You can view or subscribe here. Some articles are written by FamilyTreeDNA staff, but project administrators and customers author other content.

Multi-Language Support

Translation of the main FamilyTreeDNA website and results pages to Spanish has begun, with more languages planned soon.

Paypal, Payments, and Gift Cards

Paypal has been added as a payment selection, along with a PayPal option that provides the ability to make payments.

Additionally, a gift card can be purchased from the main page.

Million Mito Project & Mitotree

Work on the Million Mito Project is ongoing.

The Million Mito Project was launched in 2020 as a collaborative effort between FamilyTreeDNA’s Research & Development Team and the scientific portion of the Genographic Project. I’m a team member and wrote about the Million Mito Project, here.

We’re picking up from where the Phylotree left off in 2016, analyzing 20 times more mtDNA full sequences and reimagining the mtDNA Haplotree. By examining more mtDNA data and applying the processes that allowed FamilyTreeDNA to build the world’s largest Y DNA Haplotree, we can also create the world’s largest Mitotree.

In 2022, the first update was released, authored by the Million Mito team, with the discovery of haplogroup L7. You can read about this amazing discovery rooted deep in the tree here, here, and here. (Full disclosure: I’m a co-author.)

Not only that, but “Nature Scientific Reports” selected this article as one of five named Editor’s Choice in the Mitogenomics category, here. In the science world, that’s a HUGE deal – like the genetic Emmy.

Here’s one example of the type of improvements that can be expected. Currently, the formation of haplogroup U5a2b2a reaches back to about 5000 years ago, but after reanalysis, current branches originated between 500 and 2,500 years ago, and testers are clustered more closely together.

This is SOOO exciting!!!

Just as Discover for Y DNA results was built one feature at a time, the same will be true for MitoDiscover. That’s my name, not theirs.

As the new Mitotree is rolled out, the user interface will also be updated, and matching will function somewhat differently. Specifically, it’s expected that many more haplogroups will be named, so today’s matching that requires an exact haplogroup match to be a full sequence match will no longer work. That and other matching adjustments will need to be made.

I can hardly wait. I have so many results I need to be able to view in a tree format and to place in a timeframe.

You can be included in this exciting project, learn more about your matrilineal (mother’s) line, and hopefully break down some of those brick walls by taking the full sequence mitochondrial DNA test, here.

After the new Mitotree is rolled out and the Y DNA Family Finder haplogroups are completed, Family Finder customers, where possible, will also receive at least a basic-level mitochondrial haplogroup. Not all upload files from other vendors include mtDNA SNPs in their autosomal files. The mitochondrial Family Finder haplogroup feature isn’t expected until sometime in 2025, after the new tree and MitoDiscover are complete.

The Future

What’s coming later in 2024, or is ongoing?

Privacy Laws

Most people aren’t aware of the new privacy laws in various states, each of which has to be evaluated and complied with.

The effects of these changes will be felt in various areas as they are implemented.

New Kits Opted Out of IGG

Since late August, all new FTDNA kits are automatically opted OUT of Investigative Genetic Genealogy (IGG) by default.

Regular matching consent and IGG matching consent have been separated during onboarding.

Biobanking Separate Consent

Another consent change is to have your sample biobanked. FamilyTreeDNA has always maintained your sample for “roughly 25 years.” You could always ask to have your sample destroyed, but going forward, you will be asked initially if you want your sample to be retained (biobanked.) It’s still free.

Remember, if someone declines the biobanking option, their DNA will be disposed of after testing. They can’t order upgrades without submitting a new sample. Neither can their family after they’re gone. I ordered my mother’s Family Finder test many years after she had gone on to meet our ancestors – and I’m incredibly grateful every single day.

MyHeritage Tree Integration

An exciting change coming next year is tree integration with MyHeritage.

And no, before any rumors get started, FAMILYTREEDNA IS NOT MERGING WITH MYHERITAGE. It’s a beneficial marriage of convenience for both parties.

In essence, one of the primary focuses of MyHeritage is trees, and they do that very well. FamilyTreeDNA is focused on DNA testing and their existing trees have had issues for years. MyHeritage trees are excellent, support pedigree collapse, provide search capabilities that are NOT case sensitive, SmartMatching, and much more.

If you don’t have a MyHeritage account, creating one is free, and you will be able to either port your existing FamilyTreeDNA tree, or begin one there. If you’re already a MyHeritage member, FamilyTreeDNA and MyHeritage are planning together for a smooth integration for you. More detailed information will be forthcoming as the integration progressed and is released to customers.

You’ll be able to connect multiple kits to your tree at MyHeritage, just like you can at FamilyTreeDNA today, which enables family matching, aka bucketing.

You can also have an unlimited number of different trees at MyHeritage on the same account. You’re not limited to one.

After you link your initial FamilyTreeDNA kit to the proper person in your MyHeritage tree, you’ll be able to relink any currently linked kits.

MyHeritage will NOT receive any DNA information or match information from FamilyTreeDNA, and yes, you’ll be able to use the same tree independently at MyHeritage for their DNA matching.

You’ll still be able to view your matches’ trees, except it will actually be the MyHeritage tree that will be opened at FamilyTreeDNA in a new tab.

To the best of my knowledge, this is a win-win-win, and customers of both companies aren’t losing anything.

One concern is that some FamilyTreeDNA testers have passed away and cannot transition their tree, so a view-only copy of their tree will remain at FamilyTreeDNA so that their matches can still see their tree.

Big Y Infrastructure

Katy mentioned that internal discussions are taking place to see what changes could be made to improve things like matching and test processing times.

No changes are planned for SNP or STR coverage, but discussions are taking place about a potential update to the Telomere to Telomere (T2T) reference. No promises about if or when this might occur. The last part of the human genome to be fully sequenced, the T2T reference model includes the notoriously messy and unreliable region of the Y chromosome with many repeats, duplications, gaps, and deletions. Some data from this region is probably salvageable but has previously been omitted due to the inherent problems.

I’m not sure this shouldn’t be in the next section, the Wishlist.

Wishlist

There are lots of good things on the Wishlist – all of which I’d love.

I’d have difficulty prioritizing, but I’d really appreciate some Family Finder features in addition to the items already discussed. I’d also like to see some GAP (administrator) tool updates.

Which items do you want to see most?

Katy said that FamilyTreeDNA is NOT planning to offer a Whole Genome Sequencing (WGS) test anytime soon. So, if you’re holding your breath, please don’t. Based on what Katy did say, WGS is very clearly not a consideration in 2024 and I don’t expect to see it in 2025 either unless something changes drastically in terms of technology AND pricing.

While WGS prices have come down, those consumer tests are NOT scanned at the depth and quality required for advanced tests like the Big Y or even Family Finder. Normally consumer-grade WGS tests are scanned between 2 and 10 times, where the FamilyTreeDNA lab scans up to 30 times in order to obtain a quality read. 30X scans are in the same category as medical or clinical grade whole genome scans. Significantly higher quality scans mean significantly higher prices, too, so WGS isn’t ready for genealogy prime time yet.

Additionally, commercially available WGS tests are returned to the customer “as is,” and you’re left to extract the relevant SNPs and arrange them into files, or find someone else to do that. Not to mention, in order to preserve the integrity of their database, FamilyTreeDNA does not accept Y or mitochondrial DNA uploads.

Recently, I saw two WGS files with a 20-25% no-call rate for the autosomal SNPs required for the Family Finder test. Needless to say, that’s completely unacceptable. Some tools attempt to “fix” that mess by filling in the blanks in the format of either a 23andMe or Ancestry file so you can upload to vendors, but that means you’re receiving VERY unreliable matches.

The reason none of the major four vendors offer WGS testing for genealogists is because it’s not financially feasible nor technologically beneficial. The raw data file alone won’t fit on most home computers. WGS is just not soup yet, and it won’t be for the general consuming public, including relevant tools, for at least a few years.

I’ve had my whole genome sequenced, and trust me, I wish it were feasible now, but it just isn’t.

Suggestions Welcomed

Katy said that if you have suggestions for items NOT on the wishlist today to contact her through support.

I would add that if you wish to emphasize any specific feature or need above others, please send that feedback, politely, to support as well.

Katy ended by thanking the various teams and individuals whose joint efforts together produce the products we use and enjoy today.

Lab Update

Normally, DNA testing companies don’t provide lab updates, but this conference is focused on group project administrators, who are often the most dedicated to DNA testing.

A lab update has become a tradition over the years.

Linda Jones, Lab Manager, provided a lab update.

You may or may not know that the FamilyTreeDNA lab shifted gears and stepped up to handle Covid testing.

Supply-chain shortages interfered, but the lab ran 24×7 between 2020 and 2022.

Today, the lab continues to make improvements to processes with the goal of delivering the highest quality results in a timely manner.

On Monday, after the conference, attendees could sign up for a lab tour. You might say we are a rather geeky bunch and really enjoy the science behind the scenes.

Q&A and Thank You

At the end of the conference, the FamilyTreeDNA management team answered questions from attendees.

Left to right, Daniel Au, CTO; Linda Jones, Lab Manager; Katy Rowe-Schurwanz, Product Manager; Clayton Conder, VP Marketing; Goran Runfeldt, Head of R&D; and Andrew Gefre, Development Manager. Not pictured, Jeremy Balkin, Support Manager; Kelly Jenkins, VP of Operations; and Janine Cloud, Group Projects Manager. Janine is also responsible for conferences and events, without whom there would have been no 2023 FamilyTreeDNA conference. Janine, I can’t thank you enough!

A huge thanks to all of these people and many others, including the presenters, CSRs,  IT, and other FamilyTreeDNA team members for their support during the conference, enabling us to enjoy the conference and replenish the well of knowledge.

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Holiday DNA Sales Are Here!!!

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I apologize for the brevity of this posting, but I came home from the FamilyTreeDNA Conference this past weekend with “conference crud.”

I’ll catch you up on that great conference later, but sales won’t wait, and the holiday sales have already begun. This is a great time to order. These prices are the lowest ever.

MyHeritage

The MyHeritage autosomal test is only $36, and shipping is free if you order two or more DNA tests. That’s a GREAT deal. Click here to order.

If you’ve already tested elsewhere, you can upload your raw DNA file from that vendor to MyHeritage, here. I’ve provided step-by-step instructions, here. After you’ve uploaded, be sure to purchase the $29 unlock for advanced autosomal features, including the MyHeritage chromosome browser and Theories of Family Relativity, which shows you how you connect with DNA matches who share the same ancestor in MyHeritage’s collection of 52 million trees.

If you’re new to MyHeritage, you can also purchase a data or records subscription here, including a free trial.

I use this combination of DNA, trees, and tools almost daily and love that MyHeritage sends me regular record matches from their billions of genealogy records.

FamilyTreeDNA

Every test is on sale at FamilyTreeDNA.

As you know, FamilyTreeDNA provides Y-DNA, mitochondrial, and autosomal testing through their Family Finder test. They also accept autosomal DNA file uploads from Ancestry and MyHeritage. You’ll find easy download and upload instructions for each vendor, here. The advanced feature unlock is on sale now for just $9!

You can order each test individually or bundle tests for a better price.

Note that the introductory Y-DNA 37-marker test is available for $99, and can later be upgraded to the Big-Y test. However, the Big Y-700 is on sale for $399 which is a great price. Y-DNA testing unlocks your paternal ancestor’s history revealed in FamilyTreeDNA‘s world-class Discover tools.

If you’ve already tested at FamilyTreeDNA and would like to add another test for yourself or upgrade, say to the Big-Y test, just click here, sign on, and click on the Add Ons and Upgrade button in the upper right-hand corner.

I hope I’m not spilling the beans, but all sale prices, including upgrades and autosomal transfer unlocks, are shown below:

Genealogy Goals

The holidays are coming! Take a look at what you need for your genealogy.

I decided a long time ago it’s absolutely fine to “gift myself” with purchases and upgrades for my cousins. Especially the Big Y-700 at FamilyTreeDNA and the mitochondrial DNA test, which is vastly underutilized. This helps my genealogy immensely, as well as theirs. Most people are happy to swab, especially if you’re doing the genealogy work.

My goal is to:

  • Have the autosomal DNA of each of my family members and cousins in both databases that provide chromosome browsers so that I can confirm ancestors at FamilyTreeDNA and MyHeritage.
  • Find male cousins to test for the Y-DNA, the surname lineage of each of my ancestral lines. Males who descend paternally from each male ancestor can usually be tracked by their surname.
  • Mitochondrial DNA for each of my ancestors. For mitochondrial DNA testing, we need testers descended through all females from each female ancestor, although males in the current generation can test. Everyone has their mother’s direct matrilineal line mitochondrial DNA.

To find testing candidates for your lineages, check projects at FamilyTreeDNA, autosomal matches at all vendors, your ancestors at WikiTree, ThruLines at Ancestry, even though ThruLines is still having issues, and Theories of Family Relativity at MyHeritage.

With DNAtests on sale right now, this is a great time to purchase tests at MyHeritage and FamilyTreeDNA.

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You’re always welcome to forward articles or links to friends and share on social media.

If you haven’t already subscribed (it’s free,) you can receive an email whenever I publish by clicking the “follow” button on the main blog page, here.

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I receive a small contribution when you click on some of the links to vendors in my articles. This does NOT increase your price but helps me keep the lights on, and this informational blog free for everyone. Please click on the links in the articles or to the vendors below if you are purchasing products or DNA testing.

Thank you so much.

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Globetrekker – A New Feature for Big Y Customers From FamilyTreeDNA

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FamilyTreeDNA recently released Globetrekker, a great new feature for Big Y customers as part of the Discover tools. You can read about the Discover tools, here.

What Is Globetrekker?

Globetrekker is a new mapping feature that maps your Y-DNA ancestral migration path from Y-Adam in Africa born about 200,000 years ago to where your direct paternal ancestors are found most recently based on:

  • The earliest known ancestor (EKA) locations of you, your matches and other testers
  • Ancient DNA samples
  • Various geographic criteria including elevation, migration corridors, sea levels, and glaciers.

This data-driven model also includes sea levels over time and some climate factors, such as glaciation. Clearly, our ancestors needed access to clean water, food and an environment where they weren’t going to freeze to death. If they had to choose between migrating along a lower level coastal region, or heading straight across the high mountains into the unknown, it’s more likely that they took the lower elevation coastal route with assured food.

Globetrekker displays the “most likely” corridors for you to review.

While you only see your Y-DNA line initially, the map includes 48,000 migration paths for all haplogroups spread across each continent. If you’ve taken the Big Y test, you can view any of the haplogroups in Discover.

And, there’s an integrated tree browser, too.

You can read FamilyTreeDNA’s blog article, written by Goran Runfeldt, head of R&D, here.

Please Note

  • Everyone must sign into their own account to use the new Globetrekker tool. To use the rest of the Discover features, everyone can use the public version of the tool, but Globetrekker is for Big Y customers only, which is why you need to sign in. You’ll also receive more information in other categories, such as Notable and Ancient Connections, if you access Discover through your account. The free public version is limited.
  • If you’re a project administrator and you normally view your project members’ results through your project (with member-granted authorization, of course) you can’t do that yet with Globetrekker.
  • This means that every tester has to sign on using their own kit number and password. FamilyTreeDNA is working on Group Administrator access, so don’t despair if you normally depend on your volunteer administrator to handle things for you and explain. It’s coming.
  • The migration map includes only pre-Columbian migrations. In other words, if your EKA is not Native American and is brick-walled in the US, you won’t see it on the map. You’ll see your closest haplogroup location before about 1500.
  • These routes will change over time with additional testers whose results will shift and refine the paths.

Best Thing You Can Do

The best things you can do, aside from taking (or upgrading to) a Big Y-700 test are:

  • Complete your earliest known ancestor (EKA) information.
  • Be SURE to include a country AND a location of origin because that’s the data Globetrekker draws from.
  • If your cousins test too, you may be assigned a new, more refined haplogroup, so recruit people. If you don’t know anyone specific, looking at your STR matches is a good resource to find candidates.

Adding Your EKA

To add your EKA and their geographic location, sign in to your account and click on your name, which will display a menu.

Select Account Settings.

Select Genealogy, then Earliest Known Ancestors, then complete the information, including Country, which assigns the flag, among other things. Click on update location to complete or change this location.

Search or place the pin in the correct location. Then click Save.

There are three very important pieces of EKA information that need to be completed to reap all the benefits of the Matches Map, Discover, the Time Tree, the Group Time Tree that includes ancestors, and Globetrekker.

  1. EKA Name and birth/death date
  2. Country of Origin field using the dropdown (Please note Native American entries for proven Native ancestors/haplogroups)
  3. Ancestral Location for specific locations for the Matches Map

While you’re here, enter your direct matrilineal ancestor’s information too – that’s your mother’s mother’s mother’s line, which you’ll need for mitochondrial DNA..

Then, click the orange Save button at the bottom of the page.

Your map location will also appear on your STR Matches Map. You may find relevant matches there, even if they haven’t taken the Big Y test.

There’s immense power in collaboration.

I often reach out to STR panel (12-111 markers) matches and men with the same or similar surnames, asking if they will consider upgrading to the Big Y, sometimes providing testing scholarships. The only way to obtain the most refined haplogroup possible and the most accurate migration path is for multiple people in the same lineage to test AND complete the location information.

Now that we’ve completed our housekeeping, let’s look at Globetrekker.

Globetrekker Quick Test Drive

I’ll be writing about Globetrekker results in detail soon, but for right now, let’s just take a quick spin.

Click on any image to enlarge

Sign in to your account and click on the Discover Haplogroup Reports under Y-DNA Results and Tools.

You’ll see your Haplogroup Story, of course, and on the left side, you’ll see the Globetrekker link. Click on Globetrekker.

It Takes Two to Tango

Please note the introduction at the top of the Globetrekker page, and don’t get drawn into the beautiful map without reading this part first, along with the Release Announcement, Caveats, and Survey. Please take the survey after you’ve used Globetrekker.

Click on image to enlarge

  • In order to RECEIVE a detailed haplogroup, it takes at least two people with the variant (mutation) that is then named and becomes the same haplogroup. This is why we recommend that men ask a cousin from the same paternal line to test, or even a father/brother/uncle.
  • To MAP the location of a haplogroup on Globetrekker, it takes at least two people with the same haplogroup who have selected a location. Looking at my cousin’s results, I had already entered his EKA and location, but apparently his Big Y matches have not, so there are not two men with R-ZS3700 who have locations specified. I need to contact his matches.

Be sure to enter all of your EKA info. If your cousins have tested, they need to enter their information as well.

  • Globetrekker cannot use results for the mapping function without locations.
  • Globetrekker cannot use non-Native American haplogroups that are recorded with a location in the Americas. Globetrekker does provide Native American mapping in North and South America when the haplogroup is Native and a location is provided.
  • Globetrekker CAN utilize coordinates in the Americas, but a country of origin in Europe or elsewhere pre-Columbus. Globetrekker defaults to the country of origin. Please make sure this information is accurate and not just a guess or oral history.

Locations or at least countries need to be as accurate as possible. If there are only two men with a specific haplogroup, for example, and one enters England and the other enters France, Globetrekker tries to plot the location of that haplogroup someplace in the middle. In this circumstance, probably neither person is happy – both complaining about inaccuracy. Yet another reason why it’s a good thing to help your fellow genealogists.

Therefore, if you notice that you have a Big Y match on either your Big Y match list, or your STR (12-111 panel) matches, and they don’t have an EKA and country listed, with a location displayed on the matches map, PLEASE email them and ask nicely if they will add that info. You can send them a link to this article to explain why providing that information is critically important for them AND the people they match, just like your information is crucial to them. Without location data, Globetrekker paths can’t be calculated correctly, and sometimes not at all. The more data, the greater the accuracy.

After you enter your EKA information and after Big Y results are back, it will be a week or so before Discover and Globetrekker are up to date. Discover is updated weekly, and if a new haplogroup is added, Globetrekker will be up to date the following week.

Drum Roll Please…..

Here it is. The new highly refined Globetrekker migration map. It’s a beauty!

Your end-of-line haplogroup, or the closest one that can be calculated, will be shown in orange. In this case, it’s R-BY490 (circa 1650 CE) because the location of R-ZS3700 (circa 1700 CE) can’t be calculated.

On the map, you can see the various haplogroups that are upstream of haplogroup R-BY490, meaning parent haplogroups.

The path from Y-Adam in Africa is mapped, with the color changing to represent the birth of each major haplogroup in the migration path.

For example, I clicked on the pin for haplogroup CF, which expanded that haplogroup to CF-P143 and showed information about how the haplogroup pin was located on the map – plus the age and sea level difference at the time.

Scroll down on the map until you see the play button. Clicking on that button animates the migration path, beginning with Y-Adam, then progressing to the most current pre-Columbian migration.

In this case, I paused the video at the formation of haplogroup R1.

Notice the glaciation that both forms and recedes. Clearly, your ancestors weren’t living there during glaciation, but humans moved into those areas after the glaciers thawed and retreated.

You may be surprised at the path your ancient ancestors took, so I encourage you to spend some time with this map, reviewing the approximate path and your parental haplogroups with an open mind.

A legend is located in the far right upper corner to help explain the map details, including Ocean Currents and the various sea level colors.

Notice Doggerland, in dark green, which was a land mass when some haplogroups arrived in what is now the British Isles. Doggerland flooded sometime between 6500 and 6200 BCE, or about 8500 years ago, so it’s sea today. In other coastal locations, some previous land areas are covered by water today. Note the Baltic above, for example. Truthfully, that explains a lot. I knew about Doggerland but not about many of the other coastal regions around the world.

Pay close attention to what’s happening on the map. I noticed that my red pin for the current haplogroup is found in Deal, England, but so is an earlier haplogroup, so the later pin obscures the earlier pin. I enlarged the map and paused the video at 1400 CE so the red pin doesn’t form yet, then clicked on haplogroup R-Z290 that arrived from across the English Channel.

The R-Z290 pin location tells me that my Estes male ancestors arrived from continental Europe around 4650 years ago. My assumption (there’s that word again) had been that the original Estes ancestors arrived, then stayed right in Deal, a coastal village very near Dover, the closest point to the European mainland. According to Globetrekker, that wasn’t at all what happened.

I was initially somewhat skeptical, but then looking at all of the upstream haplogroups, I realized that those 17 haplogroups upstream of R-BY490 had to get into the other parts of the British Isles somehow – and my ancestor clearly descends from those men.

Could my ancestors have crossed back over to the European mainland at some point, then recrossed into Deal? Yes, of course, but without any genetic or other evidence, that’s speculation ONLY, with nothing at all to support it. In other words, that speculation would be based on what I believed all these years and nothing more.

The data-driven genetic scientific evidence tells us that our Estes ancestor arrived in what is today England about 4500 years ago. As you can see, there are a total of 17 points in England that have been reliably placed, not just one or two that might be open to speculation. Additionally, we have ancient DNA evidence.

Notice the functions at the top of the map. Turn on Ancient Connections. You’ll see the little shovels appear when their timeframe and location are relevant to the map migration, then disappear when it isn’t.

Pause the map again, and click on the shovel to display relevant information about the archaeology dig that produced Y-DNA results of sufficient quality to be included. Those ancient samples often anchor haplogroups in a known place at a specific time.

While you’re enjoying different views, try the other options at the top of the Globetrekker map.

Integrated Tree Browser

Scroll down beneath the map to view the integrated tree browser.

This is VERY cool because the tree browser moves in tandem with the map above.

You can see that the migration map shows R-BY487, and on the timeline below, R-BY487 is showing at the top, along with the downstream haplogroups.

R-BY482 (circa 1500 CE), R-BY490 (circa 1650 CE), and R-ZS3700 (circa 1700 CE) are all Estes surname haplogroups. Prior to that, R-BY487 (circa 750 CE) has no associated surname. Surnames hadn’t been adopted yet, but we know approximately where they were living just the same. We can now reference the appropriate historical period in England to determine what was happening when they lived there.

Why the Big Y?

The Big Y test does five things extremely well:

  1. Scans millions of locations on the Y chromosome looking for mutations that, when compared with other Big Y testers, places men conclusively on their branch, and sometimes on their twig and leaf of the Y-DNA haplotree. Men carrying previously undiscovered mutations from the same line establish a newly named haplogroup.
  2. Unambiguously matches testers with men who descend from a common ancestor. SNPs, the mutations measured in the Big Y test are not subject to back-mutations and other occasional instabilities that plague the STR markers in the 12-111 panel tests.
  3. Provides matching to both STR and SNP markers, allowing genealogical connections to men who have taken either type of test. Some people who have taken STR tests have either chosen not to upgrade (yet) or may have passed away. With the Big Y test, those legacy tests, some of which are more than 20 years old, are still useful.
  4. Provides an estimated date of when the common ancestor lived.
  5. Reaches reliably back in time, before the age of surnames, allowing testers to peer into the past based on a combination of genetics and history.

In other words, the Big Y test provides the best of both worlds, genealogy for close surname matches and anthropology for ancient matching and migration.

Lots to Explore

Globetrekker results are available to men who took either the Big Y-500 or the Big Y-700. Those who took the Big Y-500 can upgrade for significantly more refinement and potentially new haplogroups. Men who have not yet tested, or who just ordered one of the STR panels can upgrade to learn about your matches, your haplogroup, and the migration path through history your ancestor trod to arrive where your EKA lived.

I’m looking forward to reviewing all of the kits I manage that have taken the Big Y test. Let me know what you think about your Globetrekker results, and be sure to complete the survey and let FamilyTreeDNA know too.

If you’d like to learn more about your Big Y results, be sure to check out both Discover and Globetrekker. Discover is public, but Big Y testers will receive more information. Globetrekker is for Big Y customers only.

Remember, both will change as more people test and new results come in, so check back often.

The FamilyTreeDNA Big Y Facebook Group

A few weeks ago, FamilyTreeDNA introduced their FamilyTreeDNA Big Y Group on Facebook. As of today, just shy of 8000 people have joined. You do have to agree to follow the rules, but you don’t need to have taken a Big Y test. Lots of people join to learn, including many women who manage Y-DNA tests for family members or people who just want to understand more about one of the three types of tests for genetic genealogy.

You’re welcome to join too, here.

The Summer Sale

Several people have asked when the Big Y or the upgrades would be on sale. The summer sale runs from August 1-31, and all Y-DNA tests and upgrades are included, here.

If you’ve already taken one of the STR panel tests, or the Big Y-500, the Big Y-700 is less expensive when you upgrade. Just sign in to your account and click on the orange Add Ons and Upgrades button at the top right of your page, then on “Upgrades.”

Click here to purchase or upgrade.

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If you haven’t already subscribed (it’s free,) you can receive an email whenever I publish by clicking the “follow” button on the main blog page, here.

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I receive a small contribution when you click on some of the links to vendors in my articles. This does NOT increase the price you pay but helps me to keep the lights on and this informational blog free for everyone. Please click on the links in the articles or to the vendors below if you are purchasing products or DNA testing.

Thank you so much.

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Which DNA Test Should I Buy? And Why?

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Which DNA test should I buy, and why?

I receive questions like this often. As a reminder, I don’t take private clients anymore, which means I don’t provide this type of individual consulting or advice. However, I’m doing the next best thing! In this article, I’m sharing the step-by-step process that I utilize to evaluate these questions so you can use the process too.

It’s important to know what questions to ask and how to evaluate each situation to arrive at the best answer for each person.

Here’s the question I received from someone I’ll call John. I’ve modified the wording slightly and changed the names for privacy.

I’m a male, and my mother was born in Charleston, SC. My maternal grandmother’s maiden name was Jones and a paternal surname was Davis. The family was supposed to have been Black, Dutch, Pennsylvania Dutch, and Scots-Irish…only once was I told I was 3/16 Indian, with Davis being 3/4 and Jones being full Indian.

Do I have enough reasonable information to buy a test, and which one?

Please note that it’s common for questions to arrive without all the information you need to provide a sound answer – so it’s up to you to ask those questions and obtain clarification.

Multiple Questions

There are actually multiple questions here, so let me parse this a bit.

  1. John never mentioned what his testing goal was.
  2. He also never exactly said how the paternal line of Davis was connected, so I’ve made an assumption. For educational purposes, it doesn’t matter because we’re going to walk through the evaluation process, which is the same regardless.
  3. John did not include a tree or a link to a tree, so I created a rudimentary tree to sort through this. I need the visuals and normally just sketch it out on paper quickly.
  4. Does John have enough information to purchase a test?
  5. If so, which test?

There is no “one size fits all” answer, so let’s discuss these one by one.

Easy Answers First

The answer to #4 is easy.

Anyone with any amount of information can purchase a DNA test. Adoptees do it all the time, and they have no prior information.

So, yes, John can purchase a test.

The more difficult question is which test, because that answer depends on John’s goals and whether he’s just looking for some quick information or really wants to delve into genealogy and learn. Neither approach is wrong.

Many people think they want a quick answer –  and then quickly figure out that they really want to know much more about their ancestors.

I wrote an article titled DNA Results – First Glances at Ethnicity and Matching for new testers, here.

Goals

Based on what John said, I’m going to presume his goals are probably:

  • To prove or disprove the family oral history of Black, Dutch, Pennsylvania Dutch (which is actually German,) Scots-Irish, and potentially Native American.
  • John didn’t mention actual genealogy, which would include DNA matches and trees, so we will count that as something John is interested in secondarily. However, he may need genealogy records to reach his primary goal.

If you’re thinking, “The process of answering this seemingly easy question is more complex than I thought,” you’d be right.

Ethnicity in General

It sounds like John is interested in ethnicity testing. Lots of people think that “the answer” will be found there – and sometimes they are right. Often not so much. It depends.

The great news is that John really doesn’t need any information at all to take an autosomal DNA test, and it doesn’t matter if the test-taker is male or female.

To calculate each tester’s ethnicity, every testing company compiles their own reference populations, and John will receive different results at each of the major companies. Each company updates their ethnicity results from time to time as well, and they will change.

Additionally, each company provides different tools for their customers.

The ethnicity results at different companies generally won’t match each other exactly, and sometimes the populations look quite different.

Normally, DNA from a specific ancestor can be found for at least 5 or 6 generations. Of course, that means their DNA, along with the DNA from all of your other ancestors is essentially combined in a communal genetic “pot” of your chromosomes, and the DNA testing company needs to sort it out and analyze your DNA for ethnicity.

DNA descended from ancestors, and their populations, further back in people’s trees may not be discerned at all using autosomal DNA tests.

A much more specific “ethnicity” can be obtained for both the Y-DNA line, which is a direct patrilineal line for men (blue arrow,) and the mitochondrial DNA line (pink arrows,) which is a direct matrilineal line for everyone, using those specific tests.

We will discuss both of those tests after we talk about the autosomal tests available from the four major genealogy DNA testing companies. All of these tools can and should be used together.

Let’s Start with Native American

Let’s evaluate the information that John provided.

John was told that he “was 3/16 Indian, with Davis being 3/4 and Jones being full Indian.”

We need to evaluate this part of his question slightly differently.

I discussed this in the article, Ancestral DNA Percentages – How Much of Them is in You?

First, we need to convert generations to 16ths.

You have two ancestors in your parent’s generation, four in your grandparents, and so forth. You have 16 great-great-grandparents. So, if John was 3/16th Native, then three of his great-great-grandparents would have been fully Native, or an equivalent percentage. In other words, six ancestors in that generation could have been half-Native. Based on what John said, they would have come from his mother’s side of the tree. John is fortunate to have that much information to work with.

He told us enough about his tree that we can evaluate the statement that he might be 3/16ths Native.

Here’s the tree I quickly assembled in a spreadsheet based on John’s information.

His father, at left, is not part of the equation based on the information John provided.

On his mother’s side, John said that Grandfather Davis is supposed to be three-quarters Native, which translates to 12/16ths. Please note that it would be extremely beneficial to find a Y-DNA tester from his Davis line, like one of his mother’s brothers, for example.

John said that his Grandmother Jones is supposed to be 100% Native, so 16/16ths.

Added together, those sum to 28/32, which reduces down to 14/16th or 7/8th for John’s mother.

John would have received half of his autosomal DNA from his mother and half from his non-Native father. That means that if John’s father is 100% non-Native, John would be half of 14/16ths or 7/16ths, so just shy of half Native.

Of course, we know that we don’t always receive exactly 50% of each of our ancestors’ DNA (except for our parents,) but we would expect to see something in the ballpark of 40-45% Native for John if his grandmother was 100% Native and his grandfather was 75%.

Using simple logic here, for John’s grandmother to be 100% Native, she would almost assuredly have been a registered tribal member, and the same if his grandfather was 75% Native. I would think that information would be readily available and well-known to the family – so I doubt that this percentage is accurate. It would be easy to check, though, on various census records during their lifetimes where they would likely have been recorded as “Indian.” They might have been in the special “Indian Census” taken and might be living on a reservation.

It should also be relatively easy to find their parents since all family members were listed every ten years in the US beginning with the 1850 census.

The simple answer is that if John’s grandparents had as much Native as reported, he would be more than 3/16th – so both of these factoids cannot simultaneously be accurate. But that does NOT mean neither is accurate.

John could be 7/8th or 40ish%, 3/16th or 18ish%, or some other percentage. Sometimes, where there is smoke, there is fire. And that seems to be the quandary John is seeking to resolve.

Would  Ethnicity/Population Tests Show This Much Native?

Any of the four major testing companies would show Native for someone whose percentage would be in the 40% or 18% ballpark.

The easiest ethnicities to tell apart from one another are continental-level populations. John also stated that he thinks he may also have Black ancestry, plus Dutch, Pennsylvania Dutch (German), and Scots-Irish. It’s certainly possible to verify that using genealogy, but what can DNA testing alone tell us?

How far back can we expect to find ethnicities descending from particular ancestors?

In this table, you can see at each generation how many ancestors you have in that generation, plus the percentage of DNA, on average, you would inherit from each ancestor.

All of the major DNA testing companies can potentially pick up small trace percentages, but they don’t always. Sometimes one company does, and another doesn’t. So, if John has one sixth-generation Native American ancestor, he would carry about 1.56% Native DNA, if any.

  • Sometimes a specific ethnicity is not found because, thanks to random recombination, you didn’t inherit any of that DNA from those ancestors. This is why testing your parents, grandparents, aunts, uncles, and siblings can be very important. They share your same ancestors and may have inherited DNA that you didn’t that’s very relevant to your search.
  • Sometimes it’s not found because the reference populations and algorithms at that testing company aren’t able to detect that population or identify it accurately, especially at trace levels. Every DNA testing company establishes their own reference populations and writes internal, proprietary ethnicity analysis algorithms.
  • Sometimes it’s not found because your ancestor wasn’t Native or from that specific population.
  • Sometimes it’s there, but your population is called something you don’t expect.

For example, you may find Scandinavian when your ancestor was from England or Ireland. The Vikings raided the British Isles, so while some small amount of Scandinavian is not what you expect, that doesn’t mean it‘s wrong. However, if all of your family is from England, it’s not reasonable to have entirely Scandinavian ethnicity results.

It’s also less likely as each generation passes by that the information about their origins gets handed down accurately to following generations. Most non-genealogists don’t know the names of their great-grandparents, let alone where their ancestors were from.

Using a 25-year average generation length, by the 4th generation, shown in the chart above, you have 16 ancestors who lived approximately 100 years before your parents were born, so someplace in the mid-1800s. It’s unlikely for oral history from that time to survive intact. It’s even less likely from a century years earlier, where in the 7th generation, you have 128 total ancestors.

The best way to validate the accuracy of your ethnicity estimates is by researching your genealogy. Of course, you need to take an ethnicity test, or two, in order to have results to validate.

Ethnicity has a lot more to offer than just percentages.

Best Autosomal Tests for Native Ethnicity

Based on my experience with people who have confirmed Native ancestry, the two best tests to detect Native American ethnicity, especially in smaller percentages, are both FamilyTreeDNA and 23andMe.

Click images to enlarge

In addition to percentages, both 23andMe and FamilyTreeDNA provide chromosome painting for ethnicity, along with segment information in download files. In other words, they literally paint your ethnicity results on your chromosomes.

They then provide you with a file with the “addresses” of those ethnicities on your chromosomes, which means you can figure out which ancestors contributed those ethnicity segments.

The person in the example above, a tester at FamilyTreeDNA, is highly admixed with ancestors from European regions, African regions and Native people from South America.

Trace amounts of Native American with a majority of European heritage would appear more like this.

You can use this information to paint your chromosome segments at DNAPainter, along with your matching segments to other testers where you can identify your common ancestors. This is why providing trees is critically important – DNA plus ancestor identification with our matches is how we confirm our ancestry.

This combination allows you to identify which Native (or another ethnicity) segments descended from which ancestors. I was able to determine which ancestor provided that pink Native American segment on chromosome 1 on my mother’s side.

I’ve provided instructions for painting ethnicity segments to identify their origins in specific ancestors, here.

Autosomal and Genealogy

You may have noticed that we’ve now drifted into the genealogy realm of autosomal DNA testing. Ethnicity is nice, but if you want to know who those segments came from, you’ll need:

  • Autosomal test matching to other people
  • To identify your common ancestor with as many matches as you can
  • To match at a company who provides you with segment information for each match
  • To work with DNAPainter, which is very easy

The great news is that you can do all of that using the autosomal tests you took for ethnicity, except at Ancestry who does not provide segment information.

Best Autosomal Test for Matching Other Testers

The best autosomal test for matching may be different for everyone. Let’s look at some of the differentiators and considerations.

If you’re basing a testing recommendation solely on database size, which will probably correlate to more matches, then the DNA testing vendors fall into this order:

If you’re basing that recommendation on the BEST, generally meaning the closest matches for you, there’s no way of knowing ahead of time. At each of the four DNA testing companies, I have very good matches who have not tested elsewhere. If I weren’t in all four databases, I would have missed many valuable matches.

If you’re basing that recommendation on which vendor began testing earliest, meaning they have many tests from people who are now deceased, so you won’t find their autosomal tests in other databases that don’t accept uploads, the recommended testing company order would be:

If you’re basing that recommendation on matches to people who live in other countries, the order would be:

Ancestry and 23andMe are very distant third/fourth because they did not sell widely outside the US initially and still don’t sell in as many countries as the others, meaning their testers’ geography is more limited. However, Ancestry is also prevalent in the UK.

If you’re basing that recommendation on segment information and advanced tools that allow you to triangulate and confirm your genetic link to specific ancestors, the order would be:

Ancestry does NOT provide any segment information.

If you’re basing that recommendation on unique tools provided by each vendor, every vendor has something very beneficial that the others don’t.

In other words, there’s really no clear-cut answer for which single autosomal DNA test to order. The real answer is to be sure you’re fishing in all the ponds. The fish are not the same. Unique people test at each of those companies daily who will never be found in the other databases.

Test at or upload your DNA to all four DNA testing companies, plus GEDmatch. Step-by-step instructions for downloading your raw data file and uploading it to the DNA testing companies who accept uploads can be found, here.

Test or Upload

Not all testing companies accept uploads of raw autosomal DNA data files from other companies. The good news is that some do, and it’s free to upload and receive matches.

Two major DNA testing companies DO NOT accept uploads from other companies. In other words, you have to test at that company:

Two testing companies DO accept uploads from the other three companies. Uploads and matching are free, and advanced features can be unlocked very cost effectively.

  • FamilyTreeDNA – free matching and $19 unlock for advanced features
  • MyHeritage – free matching and $29 unlock.for advanced features

I recommend testing at both 23andMe and Ancestry and uploading one of those files to both FamilyTreeDNA and MyHeritage, then purchasing the respective unlocks.

GEDmatch

GEDmatch is a third-party matching site, not a DNA testing company. Consider uploading to GEDmatch because you may find matches from Ancestry who have uploaded to GEDmatch, giving you access to matching segment information.

Other Types of DNA

John provided additional information that may prove to be VERY useful. Both Y-DNA and mitochondrial DNA can be tested as well and may prove to be more useful than autosomal to positively identify the origins of those two specific lines.

Let’s assume that John takes an autosomal test and discovers that indeed, the 3/16th Native estimate was close. 3/16th equates to about 18% Native which would mean that three of his 16 great-great-grandparents were Native.

John told us that his Grandmother Jones was supposed to be 100% Native.

At the great-great-grandparent level, John has 16 ancestors, so eight on his mother’s side, four from maternal grandmother Jones and four from his maternal grandfather Davis.

John carries the mitochondrial DNA of his mother (red boxes and arrows,) and her mother, through a direct line of females back in time. John also carries the Y-DNA of his father (dark blue box, at left above, and blue arrows below.)

Unlike autosomal DNA which is admixed in every generation, mitochondrial DNA (red arrows) is inherited from that direct matrilineal line ONLY and never combines with the DNA of the father. Mothers give their mitochondrial DNA to both sexes of their children, but men never contribute their mitochondrial DNA to offspring. Everyone has their mother’s mitochondrial DNA.

Because it never recombines with DNA from the father, so is never “watered down,” we can “see” much further back in time, even though we can’t yet identify those ancestors.

However, more importantly, in this situation, John can test his own mitochondrial DNA that he inherited from his mother, who inherited it from her mother, to view her direct matrilineal line.

John’s mitochondrial DNA haplogroup that will be assigned during testing tells us unquestionably whether or not his direct matrilineal ancestor was Native on her mother’s line, or not. If not, it may well tell us where that specific line originated.

You can view the countries around the world where Y-DNA haplogroups are found, here, and mitochondrial haplogroups, here.

If John’s mitochondrial DNA haplogroup is Native, that confirms that one specific line is Native. If he can find other testers in his various lines to test either their Y-DNA or mitochondrial DNA, John can determine if other ancestors were Native too. If not, those tests will reveal the origins of that line, separate from the rest of his genealogical lines.

Although John didn’t mention his father’s line, if he takes a Y-DNA test, especially at the Big Y-700 level, that will also reveal the origins of his direct paternal line. Y-DNA doesn’t combine with the other parent’s DNA either, so it reaches far back in time too.

Y-DNA and mitochondrial DNA tests are laser-focused on one line each, and only one line. You don’t have to try to sort it out of the ethnicity “pot,” wondering which ancestor was or was not Native.

My Recommendation

When putting together a testing strategy, I recommend taking advantage of free uploads and inexpensive unlocks when possible.

  • To confirm Native American ancestry via ethnicity testing, I recommend testing at 23andMe and uploading to FamilyTreeDNA, then purchasing the $19 unlock. The free upload and $19 unlock are less expensive than testing there directly.
  • For matching, I recommend testing at Ancestry and uploading to MyHeritage, then unlocking the MyHeritage advanced features for $29, which is less expensive than retesting. Ancestry does not provide segment information, but MyHeritage (and the others) do.

At this point, John will have taken two DNA tests, but is now in all four databases, plus GEDmatch if he uploads there.

  • For genealogy research on John’s lines to determine whether or not his mother’s lines were Native, I recommend an Ancestry and a MyHeritage records subscription, plus using WikiTree, which is free.
  • To determine if John’s mother’s direct matrilineal female line was Native, I recommend that John order the mitochondrial DNA test at FamilyTreeDNA.
  • When ordering multiple tests, or uploading at FamilyTreeDNA, be sure to upload/order all of one person’s tests on the same DNA kit so that those results can be used in combination with each other.

Both males and females can take autosomal and mitochondrial DNA tests.

  • To discover what he doesn’t know about his direct paternal, meaning John’s surname line – I recommend the Big Y-700 test at FamilyTreeDNA.

Only males can take a Y-DNA test, so women would need to ask their father, brother, or paternal uncle, for example, to test their direct paternal line.

  • If John can find a male Davis from his mother’s line, I recommend that he purchase the Big Y-700 test at FamilyTreeDNA for that person, or check to see if someone from his Davis line may have already tested by viewing the Davis DNA Project. Like with mitochondrial DNA, the Y-DNA haplogroup will tell John the origins of his direct Davis male ancestor – plus matching of course. He will be able to determine if they were Native, and if not, discover the origins of the Davis line.
  • For assigning segments to ancestors and triangulating to confirm descent from a common ancestor, I recommend 23andMe, MyHeritage, FamilyTreeDNA and GEDmatch, paired with DNAPainter as a tool.

Shopping and Research List

Here are the tests and links recommended above:

More Than He Asked

I realize this answer is way more than John expected or even knew to ask. That’s because there is often no “one” or “one best” answer. There are many ways to approach the question after the goal is defined, and the first “answer” received may be a bit out of context.

For example, let’s say John has 2% Native ancestry and took a test at a vendor who didn’t detect it. John would believe he had none. But a different vendor might find that 2%. If it’s on his mother’s direct matrilineal line, mitochondrial DNA testing will confirm, or refute Native, beyond any doubt, regardless of autosomal ethnicity results – but only for that specific ancestral line.

Autosomal DNA can suggest Native across all your DNA, but Y-DNA and mitochondrial DNA confirm it for each individual ancestor.

Even when autosomal testing does NOT show Native American, or African, for example, it’s certainly possible that it’s just too far back in time or has not been passed down during random recombination, but either Y-DNA or mitochondrial DNA will unquestionably confirm (or refute) the ancestry in question if the right person is tested.

This is exactly why I attempt to find a cousin who descends appropriately from every ancestor and provide testing scholarships. It’s important to obtain Y-DNA and mitochondrial DNA information for each ancestor.

Which Test Should I Order?

What steps will help you decide which test or tests to take?

  1. Define your testing goal.
  2. Determine if your Y-DNA or mitochondrial DNA will help answer the question.
  3. Determine if you need to find ancestors another generation or two back in time to get the most benefit from DNA testing. In our example, if John discovered that both of his grandparents were enrolled tribal members, that’s huge, and the tribe might have additional information about his family.
  4. Subscribe to Ancestry and MyHeritage records collections as appropriate to perform genealogical research. Additional information not only provides context for your family, it also provides you with the ability to confirm or better understand your ethnicity results.
  5. Extend your tree so that you can obtain the best results from the three vendors who support trees; Ancestry, FamilyTreeDNA, and MyHeritage. All three use trees combined with DNA tests to provide you with additional information.
  6. Order 23andMe and Ancestry autosomal DNA tests.
  7. Either test at or upload one of those tests to MyHeritage, FamilyTreeDNA, and GEDmatch.
  8. If a male, order the Big Y-700 DNA test. Or, find a male from your ancestral line who has taken or will take that test. I always offer a testing scholarship and, of course, share the exciting results!
  9. Order a mitochondrial DNA test for yourself and for appropriately descended family members to represent other ancestors. Remember that your father (and his siblings) all carry your paternal grandmother’s mitochondrial DNA. That’s often a good place to start after testing your own DNA.
  10. If your parents or grandparents are alive, or aunts and uncles, test their autosomal DNA too. They are (at least) one generation closer to your ancestors than you are and will carry more of your ancestors’ DNA.
  11. Your siblings will carry some of your ancestors’ DNA that you do not, so test them too if both of your parents aren’t available for testing.

Enjoy!!!

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Comparing DNA Results – Different Tests at the Same Testing Company

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Several people have asked about different tests at the same DNA testing company. They wondered if matching is affected, meaning whether your matches are different if you have two different tests at the same company. Specifically, they asked if you are better off purchasing a test AT a DNA testing vendor that allows uploads, rather than uploading a test from a different vendor. Does it make a difference to the tester or their matches? Do they have the same matches?

These are great questions, and the answer isn’t conclusive. It varies based on several factors.

Having multiple tests at the same DNA testing company can occur in three ways:

  • The same person tests twice at the same DNA testing company.
  • The same person tests once at the DNA testing company and uploads a test from a different testing company. Only two of the primary four DNA testing companies accept uploads from other vendors – FamilyTreeDNA and MyHeritage.
  • The same person uploads two different files from other DNA testing companies to the DNA testing company in question. For example, the DNA company could be FamilyTreeDNA and the two uploaded DNA files could be from either MyHeritage, 23andMe or Ancestry.

All DNA testing companies allow users to download their raw DNA data files. This enables the tester to upload their DNA file to the vendors who accept uploaded files. Both FamilyTreeDNA and MyHeritage provide matching for free, but advanced tools require a small unlock fee of $19 and $29, respectively.

Testing Company Accepts Uploads from Other Companies Download Upload Instructions
23andMe No Instructions here
Ancestry No Instructions here
FamilyTreeDNA Yes, some Instructions here
MyHeritage Yes, some Instructions here

I wrote about developing a DNA testing and transfer/upload strategy, here, and about which companies accept which tests, here.

Not all DNA files are created equal. Therefore, not all files from vendors are compatible with other vendors for various reasons.

Multiple Tests at the Same DNA Testing Company

I have at least two tests at each of the four major vendors. I did this for research purposes, meaning to write articles to share with you.

If you actually test twice at a vendor, meaning purchase two separate tests and take them yourself, you will have two test results at that testing company. At some companies, specifically 23andMe, if you purchase a new test through their “upgrade” procedure, you won’t have two tests, just the newer one.

However, if you’re testing at the DNA testing company, and also uploading, I generally don’t recommend more than one test at each vendor. All it really does is clog up people’s match lists with no or little additional benefit. At 23andMe, with their restrictions on the size of your match list, if everyone had two tests, the effective match limit would be half of their stated limit of about 1500 matches for earlier testers and about 5000 for current testers with subscriptions.

So, in essence, I’m telling you to “do as I say, not as I do.” We all have better things to do with our money rather pay for the same test twice. If you haven’t tested your Y-DNA or mitochondrial DNA, that’s much more beneficial than two autosomal tests at one vendor.

Chips and Chip Evolution

Before we begin the side-by-side comparison, let’s briefly discuss DNA testing chips and how they work.

Each DNA testing company purchases DNA processing equipment. Illumina is the big dog in this arena. Illumina defines the capacity and structure of each chip. In part, how the testing companies use that capacity, or space on each chip, is up to each company. This means that the different testing companies test many of the same autosomal DNA SNP locations, but not all of the same locations.

Furthermore, the individual testing companies can specify a number of “other” locations to be included on their chip, up to the chip maximum size limit. The testing companies who offer Y-DNA or mitochondrial DNA haplogroups from autosomal tests use part of their chip array space for selected known haplogroup-defining SNP locations. This does NOT mean that Y-DNA or mitochondrial DNA is autosomal, just that the testing company used part of their chip array space to target these SNPs in your genome. Of course, for your most refined haplogroup and Y-DNA or mitochondrial DNA matching, you have to take those specific tests at FamilyTreeDNA .

This means that each testing company includes and reports many of the same, but also some different SNP locations when they scan your DNA.

In the lab, after your DNA is extracted from either your saliva or the cheek swab, it’s placed on this array chip which is then placed in the processing equipment.

There are several steps in processing your DNA. Each DNA location specified on the chip is scanned and read multiple times, and the results are recorded. The final output is the raw DNA results file that you see if/when you download your raw DNA file.

Here’s an example from my file. The RSID is the reference SNP cluster ID which is the naming convention used for specific SNPs. It’s not relevant to you, but it is to the lab, along with the chromosome number and position, which is in essence the address on the chromosome.

In the Result column, your file reports one nucleotide (T, A, C or G) that you inherited from each parent at each tested position. They are not listed in “parent order” because your DNA is not organized in that fashion. There’s no way for the lab to know which nucleotide came from which parent, unless they are the same, of course. You can read about nucleotides, here.

When you upload your raw DNA file to a different DNA testing company (vendor), they have to work with a file that isn’t entirely compatible with the files they generate, or the other files uploaded from other DNA testing companies.

In addition to dealing with different file formats and contents from multiple DNA vendors, companies change their own chips and file structure from time to time. In some cases, it’s a forced change by the chip manufacturer. Other times, the vendors want to include different locations or make improvements. For example, with 23andMe’s focus on health, they probably add new medically related SNP locations regularly. Regardless of why, some DNA files include locations not included in other files and are not 100% compatible.

Looking at the first few entries in my example file above, let’s say that the testing vendor included the first ten positions, but an uploaded file from another company did not. Or perhaps the chip changed, and a different version of the company’s own file contains different positions.

DNA testing companies have to “fill in the blanks” for compatibility, and they do this using a technique called imputation. Illumina forced their customers to adopt imputation in 2017 when they dropped the capacity of their chip. I was initially quite skeptical, but imputation has worked surprisingly well. Some of the matching differences you will see when comparing the results of two different DNA files is a result of imputation.

I wrote about imputation in an early article here. Please note the companies have fixed many issues with imputation and improved matching greatly, but the concepts and imputation processes still apply. The downloaded raw data files are your results BEFORE imputation, meaning that it’s up to any company where you upload to process your raw file in the same way they would process a file that they generated. A lot goes on behind the scenes when you upload a file to a DNA testing company.

At both 23andMe and Ancestry, you know that all of your matches tested there, meaning they did not upload a file from another testing company. You don’t know and can’t tell what chip was utilized when your matches tested. The only way to determine a chip testing version, aside from knowing the date or remembering the chip version from when you tested, is to look at the beginning of the raw data download file, although not all files contain that information.

Ok, now that you understand the landscape, let’s look at my results at each company.

23andMe

I tested twice at 23andMe on two different chip versions, V3 and V4, which tested some different locations of my DNA. Neither of these chips is the current version. I originally tested twice to evaluate the differences between the two test versions which you can read about, here.

23andMe named their ethnicity results Ancestry Composition.

They last updated my V3 test’s Ancestry Composition results on July 28, 2021.

The percentages are shown at left, and the country locations are highlighted at right for my 23andMe V3 test.

Click to enlarge any graphic

The 23andMe V4 test was also updated for the last time on July 28, 2021.

The ethnicity results differ substantially between the two chip versions, even though they were both updated on the same date.

In October of 2020, in an effort to “encourage” their customers to pay for a new test on their V5 chip, 23andMe announced that there would be no ethnicity updates on older tests. So, I really don’t know for sure when my tests were actually updated. Just note how different the results are. It’s also worth mentioning that 23andMe does not show trace amounts on their map, so even though my Indigenous American results were found, they aren’t displayed on the map.

Indigenous is, however, shown in yellow on their DNA Chromosome Painting.

No other testing company restricts updates, penalizing their customers who purchased earlier versions of tests.

Matches at 23andMe

23andMe limits your matches to about 1500 unless you have purchased the current test, including health AND pay for an annual $69 subscription which buys you about 5000 matches. I have not purchased this test.

Your number of actual matches displayed/retained is also affected by how many people you have communicated with, or at least initiated communications with. 23andMe does not roll those people off of your match list.

I have 1803 matches on both of my tests, meaning I’ve reached out to about 300 people who would have otherwise been removed from my match list. 23andMe retains your highest matches, deleting lower matches after you reach the maximum match threshold.

I’ve randomly evaluated several of the same matches at each vendor, at least five maternal and five paternal, separated by a blank row. I wanted to determine whether they match me on the same number of centimorgans, meaning the same amount of DNA, on both tests, and the same number of segments.

Match 23and Me V3 23and Me V4
Patricia 292 cM – 12 segments Same as V3
Joe 148 cM, 8 segments Same
Emily 73 cM, 4 segs 72 cM, 4 seg
Roland 27 cM, 1 seg Same
Ian 62 cM, 4 seg Same
Stacy 469 cM, 16 segments 482 cM, 16 segments
Harold 134 cM, 6 segments Same
Dean 69 cM, 3 seg Same
Carl 95 cM, 4 seg Same
Debbie 83 cM, 4 seg 84 cM, 4 seg

As you can see, the matches are either exact or xclose.

Please note that bolded matches are also found at another company. I will include a summary table at the end comparing the same match across multiple vendors.

23and Me Summary

The 23andMe V3 and V4 match results are very close. Since the match limit is the same, and the results are so close between tests, they are essentially identical in terms of matching.

The ethnicity results are similar, but the V4 test reflects a broader region. Italian baffles me in both versions.

Ethnicity should never be taken at face value at any DNA testing company, especially with smaller percentages which could be noise or a combination of other regions which just happens to resemble Italy, in my case.

I don’t know what type of comparison the current chip would yield since I suspect it has more medical and less genealogical SNPs on board.

Reprocessing Tests

This is probably a good place to note that it’s very expensive for any company to update their customer’s ethnicity results because every single customer’s DNA results file must be completely rerun. Note that this does not mean their DNA itself is retested. The output raw data file is reprocessed using a new algorithm.

Rerunning means reprocessing that specific portion of every test, meaning the vendors must rent “time in the cloud.” We are talking millions of dollars for each run. I don’t know how much it costs per test, but think about the expense if it takes $1 to rerun each test in the vendor’s database. Ancestry has more than 20 million tests.

While we, as consumers, are always chomping at the bit for new and better ethnicity results – the testing companies need to be sure it really is “better,” not just different before they invest the money to reprocess and update results.

This is probably why 23andMe decided to cease updating older kits. The newer tests require a subscription which is recurring revenue.

The same is true when DNA testing companies need to rematch their entire user base. This happens when the criteria for matching changes. For example, Ancestry purged a large number of matches for all of their customers back in 2020. While match algorithm changes necessitate rematching, with associated costs, this change also provided Ancestry with the huge benefit of eliminating approximately half of their customer’s matches. This freed up storage space, either physically in their data center or space rented in the cloud, representing substantial cost-savings.

How long can a DNA testing company reasonably be expected to continue investing in a product which never generates additional revenue but for which the maintenance and reinvestment costs never end?

Ancestry and MyHeritage both hope to offset the expenses of maintaining their customer’s DNA tests and providing free updates by selling subscriptions to their record services. 23andMe wants you to purchase a new test and a yearly subscription. FamilyTreeDNA wants you to purchase a Big Y-DNA and mitochondrial DNA test.

OK, now let’s look at my matches at Ancestry.

Ancestry

I’ve taken two Ancestry tests, V1 and V2. There were some differences, which I wrote about here and here. V2 is no longer the current chip.

Except for 23andMe who wants their customers to purchase their most current test, the other companies no longer routinely announce new chip versions. They just go about their business. The only way you know that a vendor actually changed something is when the other companies who accept uploads suddenly encounter an issue with file formats. It always takes a few weeks to sort that out.

My Ancestry V1 test’s ethnicity results don’t show my Native American ethnicity.

Ancestry results were updated in June 2022

However, my V2 results do include Native American ethnicity.

Matches at Ancestry

I have many more matches on my V1 test at Ancestry because I took steps to preserve my smaller matches when Ancestry initiated its massive purge in 2020. I wrote about that here and here.

Ancestry’s SideView breaks matches down into maternal, paternal, and unassigned based on your side selection. You tell Ancestry which side is which. You may be able to determine which “side” is maternal or paternal either by your ethnicity or shared matches. While SideView is not always accurate, it’s a good place to begin.

Match Category Ancestry V1 Test Ancestry V2 Test
Maternal 15,587 15,116
Paternal 42,247 41,870
Both 2 2
Unassigned 48,999 4,127
Total 106,835 61,115

Ancestry either displays all your matches or your matches by side, which I used to compile the table above. I suspect that Ancestry is not assigning any of the smaller preserved matches to “sides” based on the numbers above.

Ancestry implemented a process called Timber that removes DNA that they feel is “too matchy,” meaning you match enough people in this region that they think it’s a pileup region for you personally, and therefore not useful. In some cases, enough DNA is removed causing that person to no longer be considered a match because they fall beneath the match threshold. I am not a fan of Timber.

Your match amount shown is AFTER Timber has removed those segments. Unweighted shared DNA is your pre-Timber match amount.

You can view the Unweighted shared DNA by clicking on the amount of shared DNA on your match list.

You can read Ancestry’s Matching White Paper, here.

Let’s take a look at my matches. I’ve listed both weighted and unweighted where they are different.

Match Ancestry V1 Ancestry V2
Michael 755 cM, 35 seg 737 cM, 33 seg
Edward 66 cM, 4 seg (unweighted 86 cM) 65 cM, 4 seg (unweighted 86 cM)
Tom 59 cM, 3 seg (unweighted 63) Same
Jonathon 43 cM, 4 seg, (unweighted 52 cM) Same
Matthew 20 cM, 2 seg (unweighted 35 cM) Same
Harold 132 cM, 7 seg 135 cM, 6 seg
Dean 67 cM, 4 seg (unweighted 78 cM) 66 cM, 4 seg (unweighted 78 cM)
Debbie 93 cM, 5 seg Same
Valli 142 cM, 3 seg Same
Jared 20 cM, 1 seg (unweighted 22 cM) Same

Timber only removes DNA when the match is under 90 cM. Almost every match under 90 cM has some DNA removed.

Ancestry Summary

The results of the two Ancestry tests are very close.

In some circumstances, no DNA is removed by Timber, so the unweighted is the same as the weighted. However, in other cases, a significant amount is removed. 15 cM of Matthew’s 35 cM was removed by Timber, reducing his total to 20 cM.

Remember that Ancestry does not show shared matches unless they are greater than 20 cM, which is different than any other DNA testing company.

At one point, Ancestry was selling a health test that was also a genealogy test. That test utilized a different chip that is not accepted for uploads by other vendors. The results of that test might well be different that the “normal” Ancestry tests focused on genealogy. The Ancestry health test is no longer offered.

Companies that Accept Uploads

DNA testing companies that accept uploaded DNA files from other DNA testing companies need to process the uploaded file, just like a file that is generated in their own lab. Of course, they must deal with the differences between uploaded files and their own file format. The processing includes imputation and formulates the uploaded file so that it works with the tools that they provide for their customers, including ethnicity (by whatever name they use) matching, family matching (bucketing), advanced matching, the match matrix, triangulation, AutoClusters, Theories of Family Relativity, and other advanced tools.

Of course, the testing company accepting uploads can only work with the DNA locations provided by the original DNA testing company in the uploaded file.

Matching and some additional tools are free to uploaders, but advanced tools require an inexpensive unlock.

FamilyTreeDNA

I took a test at FamilyTreeDNA, plus uploaded a copy of both of my Ancestry DNA files.

FamilyTreeDNA named their population (ethnicity) test myOrigins and the current version is V3. I wrote about the rollout and comparison in September of 2020, here.

My DNA test taken at FamilyTreeDNA, above, reveals Native American segments that match reference populations found both in North and South America and the Caribbean Islands.

At FamilyTreeDNA, my Ancestry V1 uploaded file results show Native American population matches only in North America.

Interestingly, my Ancestry V1 file processed AT Ancestry did not reveal Native American ancestry, but the same file uploaded to and processed at FamilyTreeDNA did show Native American results, reflecting the difference between the vendors’ internal algorithms and reference populations utilized.

My myOrigins results from my Ancestry V2 uploaded file at FamilyTreeDNA also include my North American Native American segments. The V2 test also showed Native American ethnicity at Ancestry, so clearly something changed in Ancestry’s algorithm, locations tested, and/or reference populations between V1 and V2.

Fortunately, FamilyTreeDNA provides both chromosome painting and a population download file so I can match those Native segments with my autosomal matches to identify which of my ancestors contributed those specific segments.

One of my Native segments is shown in pink on Chromosome1. My mother has a Native segment in exactly the same location, so I know that this segment originated with my mother’s ancestors.

I downloaded the myOrigins population segment file and painted my results at DNAPainter, along with the matches where I can identify our common ancestor. This allowed me to pinpoint the ancestral line that contributed this Native segment in my maternal line. You can read about using DNAPainter, here.

FamilyTreeDNA Matches

I have significantly more matches at FamilyTreeDNA on their test than on either of my Ancestry tests that I uploaded. However, nearly the same number are maternally or paternally assigned through Family Matching, with the remainder unassigned. You can read about Family Matching here.

Match Category FamilyTreeDNA Test Ancestry V1 at FamilyTreeDNA Ancestry V2 at FamilyTreeDNA
Paternal 3,479 3,572 3,422
Maternal 1,549 1,536 1,477
Both 3 3 3
All 8,154 6,397 6,579

Family matching, aka bucketing, automatically assigns my matches as maternal and paternal by linking known relatives to their place in my tree.

I completed the following match chart using my original test taken at FamilyTreeDNA, plus the same match at FamilyTreeDNA for both of my Ancestry tests.

In other words, Cheryl matched me at 467 cM on 21 segments on the original test taken at FamilyTreeDNA. She matched me on 473 cM and 21 segments on my Ancestry V1 test uploaded to FamilyTreeDNA and on 483 cM and 22 segments on the Ancestry V2 test uploaded to FamilyTreeDNA.

Match FamilyTreeDNA Ancestry V1 at FTDNA Ancestry V2 at FTDNA
Cheryl 467 cM, 21 seg 473 cM, 21 seg 483 cM, 22 seg
Patricia 195 cM, 11 seg 189 cM, 11 seg 188 cM, 11 seg
Tom 77 cM, 4 seg 71 cM, 4 seg 76 cM, 4 seg
Thomas 72 cM, 3 seg 71 cM, 3 seg 74 cM, 3 seg
Roland 29 cM, 1 seg 35 cM, 2 seg 35 cM, 2 seg
Rex 62 cM, 4 seg 55 cM, 3 seg 57 cM, 3 seg
Don 395 cM, 18 seg 362 cM, 15 seg 398 cM, 18 seg
Ian 64 cM, 4 seg 56 cM, 4 seg 64 cM, 4 seg
Stacy 490 cM, 18 seg 494 cM, 15 seg 489 cM, 14 seg
Harold 127 cM, 5 cM 133 cM, 6 seg 143 cM, 6 seg
Dean 81 cM, 4 seg 75 cM, 3 seg 83 cM, 4 seg
Carl 103 cM, 4 seg 101 cM, 4 seg 102 cM, 4 seg
Debbie 99 cM, 5 seg 97 cM, 5 seg 99 cM, 5 seg
David 373 cM, 16 seg 435 cM, 19 seg 417 cM, 18 seg
Amos 176 cM, 7 seg 177 cM. 8 seg 177 cM, 7 seg
Buster 387 cM, 15 seg 396 cM, 16 seg 402 cM, 17 seg
Charlene 461 cM, 21 seg 450 cM, 21 seg 448 cM, 20 seg
Carol 65 cM, 6 seg 64 cM, 6 seg 65 cM, 6 seg

I have tested many of my cousins at FamilyTreeDNA and encouraged others to test or upload. I’ve attempted to include enough people so that I can have common matches at least at one other DNA testing company for comparison.

FamilyTreeDNA Summary

The matches are relatively close, with a few being exact.

Interestingly, some of the segment counts are different. In most cases, this results from one segment being broken into multiple segments by one or more of the tests, but not always. In the couple that I checked, the entire segment seems to descend from the same ancestral couple, so the break is likely a result of not all of the same DNA locations being tested, plus the limits of imputation.

MyHeritage

I have two tests at MyHeritage. One taken at MyHeritage, and an uploaded file from FamilyTreeDNA.

MyHeritage displays both ethnicity results and Genetic Groups which maps groups of people that you match. I left the Genetic Groups setting at the highest confidence level. Shifting it to lower displays additional Genetic Groups, some of which overlap with or are within ethnicity regions.

My test taken at MyHeritage, above, shows several ethnicities and Genetic Groups, but no Native American.

My FamilyTreeDNA kit processed at MyHeritage shows the same ethnicity regions, one additional Genetic Group, plus Native American heritage in the Amazon which is rather surprising given that I don’t show Native in North American regions where I’m positive my Native ancestors lived.

MyHeritage Matching

At MyHeritage, I compared the results of the test I took with MyHeritage, and a test I uploaded from FamilyTreeDNA. Fewer than half of my matches can be assigned to a parent via shared matching.

Matches MyHeritage Test FamilyTreeDNA at MyHeritage
Paternal 4,422 6,501
Maternal 2,660 3,655
Total 13,233 16,147

I have rounded my matches at MyHeritage to the closest cM.

Match MyHeritage Test FamilyTreeDNA at MyHeritage
Michael 801 cM, 32 seg 823 cM, 31 segments
Cheryl 467 cM, 23 seg 477 cM, 23 seg
Roland No match 28 cM, 1 seg
Patty 156 cM, 9 seg 151 cM, 9 seg
Rex 43 cM, 4 seg 53 cM, 3 seg
Don 369 cM, 16 seg 382 cM, 17 seg
 
David 449 cM, 17 seg 460 cM, 17 seg
Charlene 454 cM, 23 seg 477 cM, 24 seg
Buster 408 cM, 15 seg 410 cM, 16 seg
Amos 183 cM, 8 seg Same
Carol 78 cM, 6 seg 87 cM, 7 seg

MyHeritage Summary

I was surprised to discover that Roland had no match with the MyHeritage test, but did with the FamilyTreeDNA test. I wonder if this is a searching or matching glitch, especially since both companies use the same chip. 28 cM in one segment is a reasonably large match, and even if it was divided in two, it would still be over the matching threshold. I know this is a valid match because Roland triangulates with me and several cousins, I’m positive of our common ancestor, and he also matches me at both FamilyTreeDNA and 23andMe.

Other than that, the matches are reasonably close, with one being exact.

Your Matches Aren’t Everyplace

I unsuccessfully searched for someone who was a match to me in all four databases. Ancestry does not permit match downloads, so I had to search manually. People don’t always use the same names in different databases.

Surprisingly, I was unable to find one match who is in all of the databases. Many people only suggest testing at Ancestry because they have the largest database, but if you look at the following comparison chart that I’ve created, you’ll see that 16 of 26 people, or 62% were not at Ancestry. Conversely, many people were at Ancestry and not elsewhere. I could not find five maternal and five paternal matches at Ancestry that I could identify as matches in another database. 40% were not elsewhere.

If you think for one minute that it doesn’t matter for genealogy if you’re in all four major databases, please reconsider. It surely does matter.

Every single vendor has matches that the others don’t. Substantial, important matches. I have found first and second-cousin matches in every database that weren’t elsewhere.

Many of the original testers have passed away and can’t test again. My mother can never test at either 23andMe or Ancestry, but she is at both FamilyTreeDNA and MyHeritage because I could upgrade her kit at FamilyTreeDNA after she died. I uploaded her to MyHeritage. Of course, because she is a generation closer to our ancestors, she has many valuable matches that I don’t.

Each vendor provides either an email address or a messaging platform for you to contact your matches. Don’t be discouraged if they don’t answer. Just today, I received a reply that was years in the making.

Genealogists hope for immediate gratification, but we are actually in this for the long game. Play it with every tool at your disposal.

The Answer

Does it matter if you test at a DNA testing company, or upload a file?

I know this was a very long answer to what my readers hoped was a simple yes or no question.

There is no consistent answer at either FamilyTreeDNA or MyHeritage, the two DNA testing companies that accept uploads. Be sure you’re in both databases. My closest two matches that I did not test were found at MyHeritage. Here’s a direct link to upload at MyHeritage.

Of the vendors, those two should be the closest to each other because they are both processed in the GenebyGene lab, but again, the actual chip version, when the test was originally taken, and each vendor’s internal processing will result in differences. Neither the original test at the DNA testing company nor the uploaded files have consistently higher or lower matches. Neither type of test or upload appears to be universally more or less accurate. Differences in either direction seem to occur on a match-by-match basis. Many are so close as to be virtually equivalent, with a few seemingly random exceptions. Of course, we always have to consider Timber.

If you upload, unlock the advanced features at both FamilyTreeDNA and MyHeritage.

If you upload to a DNA testing company, you may discover in the future that some features and functions will only be available to original testers.

Personally, if I had the option, I would test at the company directly simply because it eliminates or at least reduces the possibility of future incompatibilities – with the exception of 23andMe which has chosen to not provide consistent updates to older tests. I’m incredibly grateful I didn’t test my mother or now deceased family members at 23andMe, and only there. I would be heartsick, heartbroken, and furious.

Our DNA is an extremely valuable resource for our genealogy. It’s the gift that truly keeps on giving, day after day, even when other records don’t exist. Be sure you and your family members are in each database one way or another, and test your Y-DNA (for males) and mitochondrial DNA (for everyone) to have a complete arsenal at your disposal.

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DNA: In Search Of…Your Grandparents

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15

Are you searching for an unknown relative or trying to unravel and understand unexpected results? Maybe you discovered that one or both of your parents is not your biological parent. Maybe one of your siblings might be a half-sibling instead. Or maybe you suddenly have an unexpected match that looks to be an unknown close relative, possibly a half-sibling. Perhaps there’s a close match you can’t place.

Or, are you searching for the identity of your grandparent or grandparents? If you’re searching for your parent or parents, often identifying your grandparents is a necessary step to narrow the parent-candidates.

I’ve written an entire series of “In Search of Unknown Family” articles, permanently listed together, here. They will step you through the search process and help you understand how to unravel your results. If you’re new, reading these, in order, before proceeding, would be a good idea.

Identifying a Grandparent

I saved this “grandparents” article for later in the series because you will need the tools and techniques I’ve introduced in the earlier articles. Identifying grandparents is often the most challenging of any of the relationships we’ve covered so far. In part because each of those four individuals occupies a different place in your tree, meaning their X, Y-DNA and mitochondrial DNA is carried by different, and not all, descendants. This means we sometimes have to utilize different tools and techniques.

If you’re trying to identify any of your four grandparents, females are sometimes more challenging than males.

Why?

Women don’t have a Y chromosome to test. This can be a double handicap. Female testers can’t test a Y chromosome, and maternal ancestors don’t have a Y chromosome to match.

Of course, every circumstance differs. You may not have a male to test for paternal lines either.

The maternal grandfather can be uniquely challenging, because two types of DNA, Y-DNA and mitochondrial DNA matching are immediately eliminated for all testers.

While I’ve focused on the maternal grandfather in this example, these techniques can be utilized for all four grandparents as well as for parents. At the end, I’ll review other grandparent relationships and additional tools you might be able to utilize for each one.

In addition to autosomal DNA, we can also utilize mitochondrial DNA, Y-DNA and sometimes X DNA in certain situations.

Testing, Tests and Vendors

As you recall, only men have a Y chromosome (blue arrow), so only genetic males can take a Y-DNA test. Men pass their Y chromosome from father to son in each generation. Daughters don’t receive a Y chromosome.

Everyone has their mother’s mitochondrial DNA (pink arrow.) Women pass their mitochondrial DNA to both sexes of their children, but only females pass it on. In the current generation, represented by the son and daughter, above, the mother’s yellow heart-shaped mitochondrial DNA is inherited by both sexes of her children. In the current generation, males and females can both test for their mother’s mitochondrial DNA.

Of course, everyone has autosomal DNA, inherited from all of their ancestral lines through at least the 5th or 6th generation, and often further back in time. Autosomal DNA is divided in half in each generation, as children inherit half of each parents’ autosomal DNA (with the exception of the X chromosome, which males only inherit from their mother.)

The four major vendors, Ancestry, 23andMe, FamilyTreeDNA and MyHeritage sell autosomal DNA tests, but only FamilyTreeDNA sells Y-DNA and mitochondrial DNA tests.

Only 23andMe and FamilyTreeDNA report X matching.

All vendors except Ancestry provide segment location information along with a chromosome browser.

You can read about the vendor’s strengths and weaknesses in the third article, here.

Ordering Y and Mitochondrial DNA Tests

If you’re seeking the identities of grandparents, the children and parents, above, can test for the following types of DNA in addition to autosomal:

Person in Pedigree Y-DNA Mitochondrial
Son His father’s blue star His mother’s pink heart
Daughter None Her mother’s pink heart
Father His father’s blue star His mother’s gold heart
Mother None Her mother’s pink heart

Note that none of the people shown above in the direct pedigree line carry the Y-DNA of the green maternal grandfather. However, if the mother has a full sibling, the green “Male Child,” he will carry the Y-DNA of the maternal grandfather. Just be sure the mother and her brother are full siblings, because otherwise, the brother’s Y-DNA may not have been inherited from your mother’s father. I wrote about full vs half sibling determination, here.

Let’s view this from a slightly different perspective. For each grandparent in the tree, which of the two testers, son or daughter, if either, carry that ancestor’s DNA of the types listed in the columns.

Ancestor in Tree Y-DNA Mitochondrial DNA Autosomal DNA X DNA
Paternal Grandfather Son Neither Son, daughter Neither
Paternal Grandmother Has no Y chromosome None (father has it, doesn’t pass it on to son or daughter) Son, daughter Daughter (son does not receive father’s X chromosome)
Maternal Grandfather Neither Neither Son, daughter Son, daughter (potentially)
Maternal Grandmother Has no Y chromosome Son, daughter Son, daughter Son, daughter (potentially)

Obtaining the Y-DNA and mitochondrial DNA of those grandparents from their descendants will provide hints and may be instrumental in identifying the grandparent.

FamilyTreeDNA

You’ll need to order Y-DNA (males only) and mitochondrial DNA tests separately from autosomal DNA tests. They are three completely different tests.

At FamilyTreeDNA, the autosomal DNA test is called Family Finder to differentiate it from their Y-DNA and mitochondrial DNA tests.

Their autosomal test is called Family Finder whether you order a test from FamilyTreeDNA, or upload your results to their site from another vendor (instructions here.)

I recommend ordering the Big Y-700 Y-DNA test if possible, and if not, the highest resolution Y-DNA test you can afford. The Big Y-700 is the most refined Y-DNA test available, includes multiple tools and places Big Y-700 testers on the Time Tree through the Discover tool, providing relatively precise estimates of when those men shared a common ancestor. If you’ve already purchased a lower-precision Y-DNA test at FamilyTreeDNA, you can easily upgrade.

I wrote about using the Discover tool here. The recently added Group Time Tree draws a genetic Y-DNA tree of Big-Y testers in common projects, showing earliest known ancestors and the date of the most recent common ancestor.

You need to make sure your Family Finder, mitochondrial DNA and Y-DNA (if you’re a male) tests are ordered from the same account at FamilyTreeDNA.

You want all 3 of your tests on the same account (called a kit number) so that you can use the advanced search features that display people who match you on combinations of multiple kinds of tests. For example, if you’re a male, do your Y-DNA matches also match you on the autosomal Family Finder test, and if so, how closely? Advanced matching also provides X matching tools.

X DNA is included in autosomal tests. X DNA has a distinct matching pattern for males and females which makes it uniquely useful for genealogy. I wrote about X DNA matching here.

If you upload your autosomal results to FamilyTreeDNA from another company, you’re only uploading a raw DNA file, not the DNA itself, so FamilyTreeDNA will need to send you a swab kit to test your Y-DNA and mitochondrial DNA. If you upload your autosomal DNA, simply sign in to your kit, purchase the Y-DNA and/or mitochondrial DNA tests and they will send you a swab kit.

If you test directly at FamilyTreeDNA, you can add any test easily by simply signing in and placing an order. They will use your archived DNA from your swab sample, as long as there’s enough left and it’s of sufficient quality.

Fish In All Ponds

The first important thing to do in your grandparent search is to be sure you’re fishing in all ponds. In other words, be sure you’ve tested at all 4 vendors, or uploaded files to FamilyTreeDNA and MyHeritage.

When you upload files to those vendors, be sure to purchase the unlock for their advanced tools, because you’re going to utilize everything possible.

If you have relatively close matches at other vendors, ask if they will upload their files too. The upload is free. Not only will they receive additional matches, and another set of ethnicity results, their results will help you by associating your matches with specific sides of your family.

Why Order Multiple Tests Now Instead of Waiting?

I encourage testers to order their tests at the beginning of their journey, not one at a time. Each new test from a vendor takes about 6-8 weeks from the time you initially order – they send the test, you swab or spit, return it, and they process your DNA. Of course, uploading takes far less time.

If you’re adding elapsed time, two autosomal tests (Ancestry and 23andMe), two uploads (FamilyTreeDNA and MyHeritage,) a Y-DNA and a mitochondrial DNA test, if all purchased serially, one after the other, means you’ll be waiting about 6-8 months.

Do you want to wait 6-8 months? Can you afford to?

Part of that answer has to do with what, exactly, you’re seeking.

A Name or Information?

Are you seeking the name of a person, or are you seeking information about that person? With grandparents, you may be hoping to meet them, and time may be of the essence. Time delayed may not be able to be recovered or regained.

Most people don’t just want to put a name to the person they are seeking – they want to learn about them. You will have different matches at each company. Even after you identify the person you seek, the people you match at each company may have information about them, their photos, know about their life, family, and their ancestors. They may be able and willing to facilitate an introduction if that’s what you seek.

One cousin that I assisted discovered that his father had died just 6 weeks before he made the connection. He was heartsick.

Having data from all vendors simultaneously will allow you to compile that data and work with it together as well as separately. Using your “best” matches at each company, augmented by both Y-DNA and mitochondrial DNA can make MUCH shorter work of this search.

Your Y-DNA, if you’re a male will give you insights into your surname line, and the Big-Y test now comes with estimates of how far in the past you share a common ancestor with other men that have taken the Big-Y test. This can be a HUGE boon to a male trying to figure out his surname line.

Y-DNA and mitochondrial DNA, respectively, will eliminate many people from being your mother or father, or your direct paternal or direct maternal line ancestor. Both provide insights into which population and where that population originated as well. In other words, it provides you lineage-specific information not available elsewhere.

Your Y-DNA and mitochondrial DNA can also provide critically important information about whether that direct line ancestor belonged to an endogamous population, and where they came from.

Strategies

You may be tempted to think that you only need to test at one vendor, or at the vendor with the largest database, but that’s not necessarily true.

Here’s a table of my closest matches at the 4 vendors.

Vendor Closest Maternal Closest Paternal Comments
Ancestry 1C, 1C1R Half 1C, 2C I recognized both of the maternal and neither of the paternal.
23andMe 2C, 2C 1C1R, half-gr-niece Recognized both maternal, one paternal
MyHeritage Mother uploaded, 1C Half-niece, half 1C Recognized both maternal, one paternal
FamilyTreeDNA Mother tested, 1C1R Parent/child, half-gr-niece Recognized all 4

To be clear, I tested my mother at FamilyTreeDNA before she passed away, but if I was an adoptee searching for my mother, that’s the first database she would be in. As her family, we were able to order the Family Finder test from her archived DNA after she had passed away. I then uploaded her DNA file to MyHeritage, but she’ll never be at either 23andMe or Ancestry because they don’t accept uploads and she clearly can’t test.

Additionally, being able to identify maternal matches by viewing shared matches with my mother separates out close matches from my paternal side.

Let’s put this another way, I stand a MUCH BETTER chance of unraveling this mystery with the combined closest matches of all 4 databases instead of the top ones from just one database.

I’m providing analysis methodologies for working with results from all of the vendors together, in case your answer is not immediately obvious. Taking multiple tests facilitates using all of these tools immediately, not months later. Solving the puzzle sooner means you may not miss valuable connection opportunities.

You may also discover that the door slams shut with some people, but another match may be unbelievably helpful. Don’t unnecessarily limit your possibilities.

Here’s the testing and upload strategy I recommend.

What When Ancestry 23andMe MyHeritage FamilyTreeDNA GEDmatch
Order autosomal test Initially Yes Yes Upload Upload Upload
Order Big-Y DNA test if male Initially Yes
Order mitochondrial DNA test Initially Yes
Upload free autosomal file From Ancestry or 23andMe Yes Yes Yes
Unlock Advanced Tools When upload file $29 $19 $9.95 month
Includes X Matching No Yes No Yes Yes
Chromosome Browser, segment location information No Yes Yes Yes Yes

When you upload a DNA file to a vendor site, only upload one file per site, per tester. Otherwise, multiple tests simply glom up everyone’s match list with multiple matches to the same person and can be very confusing.

  • One person took an autosomal test at a company that accepts uploads, forgot about it, uploaded a file from another vendor later, and immediately thought she had found her parent. She had not. She “found” herself.
  • Another person though she had found two sisters, but one person had uploaded their own file from two different vendors.

Multiple vendor sites reveal multiple close matches to different people which increase your opportunity to discover INFORMATION about your family, not just the identity of the person.

Match Ranges

Given that we are searching for an unknown maternal grandfather, your mother may not have had any (known) full siblings. The “best” match would be to a full or half siblings to your parents, or their descendants, depending on how old your grandparents would be.

Let’s take the “worst case” scenario, meaning there are no full siblings AND there are many possible generations between you and the people you may match.

Now, let’s look at DNAPainter’s Shared cM tool.

You’re going to be looking for someone who is either your mother’s half sibling on her father’s side, or who is a full sibling.

If your mother is adopted, it’s possible that she has or had full siblings. If your mother was born circa 1920, it’s likely that you will be matching the next generation, or two, or three.

However, if your mother was born later, you could be matching her siblings directly.

I’m going to assume half siblings for this example, because they are more difficult than full siblings.

Full sibling relationships for your mother’s siblings are listed at right. Your full aunt or uncle at top, then their descendant generations below.

At left, in red, are the half-sibling relationships and the matching amounts.

You can see that if you’re dealing with half 1C3R (half first cousin three times removed,) you may not match.

Therefore, in order to isolate matches, it’s imperative to test every relevant relative possible.

Who’s Relevant for DNA Testing?

Who is relevant to test If you’re attempting to identify your maternal grandfather?

The goal is to be able to assign matches to the most refined ancestor possible. In other words, if you can assign someone to either your grandmother’s line, or your grandfather’s line, that’s better than assigning the person to your grandparents jointly.

Always utilize the tests of the people furthest up the tree, meaning the oldest generations. Their DNA is less-diluted, meaning it has been divided fewer times. Think about who is living and might be willing to test.

You need to be able to divide your matches between your parents, and then between your grandparents on your mother’s side.

  • Test your parents, of course, and any of their known siblings, half or full.
  • If those siblings have passed away, test as many of their children as you can.
  • If any of your grandparents are living, test them
  • If BOTH of your grandparents on the same side aren’t available to test, test any, preferably all, living aunts or uncles.
  • If your maternal grandmother had siblings, test them or their descendants if they are deceased.
  • If your parents are deceased, test your aunts, uncles, full siblings and half-siblings on your mother’s side. (Personally, I’d test all half-siblings, not just maternal.)
  • Half-siblings are particularly valuable because there is no question which “side” your shared DNA came from. They will match people you don’t because they received part of your parent’s DNA that you did not.

Furthermore, shared matches to half-siblings unquestionably identify which parent those matches are through.

Essentially, you’re trying to account for all matches that can be assigned to your grandparents whose identities you know – leaving only people who descend from your unknown maternal grandfather.

Testing your own descendants will not aid your quest. There is no need to test them for this purpose, given that they received half of your DNA.

I wrote about why testing close relatives is important in the article Superpower: Your Aunts’ and Uncles’ DNA is Your DNA Too – Maximize Those Matches!

Create or Upload a Tree

Three of the four major vendors, plus GEDMatch, support and utilize family trees.

You’ll want to either upload or create a tree at each of the vendor sites.

You can either upload a GEDCOM file from your home computer genealogy software, or you can create a tree at one of the vendors, download it, and upload to the others. I described that process at Ancestry, here.

Goal

Your goal is to work with your highest matches first to determine how they are related to you, thereby eliminating matches to known lineages.

Assuming you’re only searching for the identity of one grandparent, it’s beneficial to have done enough of your genealogy on your three known grandparents to be able to assign matches from those lines to those sides.

Step 1 is to check each vendor for close matches that might fall into that category.

The Top 15 at Each Vendor

Your closest several autosomal matches are the most important and insightful. I begin with the top 15 autosomal results at each vendor, initially, which provides me with the best chance of meaningful close relationship discoveries.

Create a Spreadsheet or Chart

I hate to use that S word (spreadsheet), because I don’t want non-technical people to be discouraged. So, I’m going to show you how I set up a spreadsheet and you can simply create a chart or even draw this out on paper if you wish.

I’ve color-coded columns for each of my 4 grandparents. The green column is the target Maternal Grandfather whose identity I’m seeking.

I match our first example; Erik, at 417 cM. Based on various pieces of information, taken together, I’ve determined that I’m Erik’s half 1C1R. His 8 great-grandparent surnames, or the ones he has provided, indicate that I’m related to Eric on my paternal grandfather’s line.

You’ll want to record your closest matches in this fashion.

Let’s look at how to find this information and work with the tools at the individual vendors.

23andMe

Let’s start at 23andMe, because they create a potential genetic tree for you, which may or may not be accurate.

I have two separate tests at 23andMe. One is a V3 and one is a V4 test. I keep one in its pristine state, and I work with the second one. You’ll see two of “me” in the tree, and that’s why.

23andMe makes it easy to see estimated relationships, although they are not always correct. Generally, they are close, and they can be quite valuable.

Click on any image to enlarge

The maternal and paternal “sides” may not be positioned where genealogists are used to seeing them. Remember, 23andMe has no genealogy trees, so they are attempting to construct a genetic tree based on how people are related to you and to each other, with no prior knowledge. They do sometimes have issues with half-relationships, so I’d encourage you to use this tree to isolate people to the three grandparents you know.

In my case, I was able to determine the maternal and paternal sides easily based on known cousins. This is the perfect example of why it’s important to test known relatives from both sides of your family.

My paternal side, at right, in blue, was easy because I recognized my half-sister’s family, and because of known cousins who I recognized from having tested elsewhere. I’ve worked with them for years. The blue stars show people I could identify, mostly second cousins.

My maternal side is at left, in red. Normally, for genealogists, the maternal side is at right, and the paternal at left, so don’t make assumptions, and don’t let this positioning throw you.

I’m pretending I don’t know who my maternal grandfather is. I was able to identify my maternal grandmother’s side based on a known second cousin.

That leaves my target – my maternal grandfather’s line.

All of the matches to the left of the red circle would, by process of elimination, be on my maternal grandfather’s side.

The next step would be to figure out how the 5 people descending from my maternal grandfather’s line are related to each other – through which of their ancestors.

On the DNA Relatives match list, here’s what needs to be checked:

  • Do your matches share surnames with you or your ancestors?
  • Do they show surnames in common with each other?
  • Is there a common location?
  • Birth year which helps you understand their potential generation.
  • Did they list their grandparents’ birthplaces?
  • Did they provide a family tree link?
  • Do they also match each other using the Relatives in Common feature?
  • Do they triangulate, indicated by “DNA Overlap” in Relatives in Common?
  • Who else is on the Relatives in Common list, and what do they have in common with each other?
  • Looking at your Ancestry Composition compared with theirs, what are your shared populations, and are they relevant? If you are both 100% European, then shared populations aren’t useful, but if both people share the same minority ancestry, especially on the same segments, it may indeed be relevant – especially if it can’t be accounted for on the known sides of the family.

Reach out to these people and see what they know about their genealogy, if they have tested elsewhere, and if they have a genealogy tree someplace that you can view.

If they can tell you their grandparents’ names, birth and death dates and locations, you can check public sources like WikiTree, FamilySearch and Geni, or build trees for them. You can also use Newspaper resources, like Newspapers.com, NewspaperArchive and the newspapers at MyHeritage.

I added the top 15 23andMe matches into the spreadsheet I created.

You’ll notice that not many people at 23andMe enter surnames. However, if you can identify individuals from your 3 known lines, you can piggyback the rest by using Relatives in Common in conjunction with the genetic tree placement.

Be sure to check all the people that are connected to the target line in your genetic tree.

You’ll want to harvest your DNA segments to paint at DNAPainter if you don’t solve this mystery with initial reviews at each vendor.

Ancestry

Let’s move to Ancestry next.

At Ancestry, you’ll want to start with your closest matches on your match list.

Ancestry classifies “Close Matches” as anyone 200 cM or greater, which probably won’t reach as far down as the matches we’ll want to include.

Some of the categories in the Shared cM Chart from DNAPainter, above, don’t work based on ages, so I’ve eliminated those. I also know, for example, that someone who could fall in the grandparent/grandchild category (blue star,) in my case, does not, so must be a different relationship.

Second cousins, who share great-grandparents, can be expected to share about 229 cM of DNA on average, or between 41 and 592 cM. First cousins share 866 cM, and half first cousins share 449 cM on average.

I have 13 close matches (over 200 cM), but I’m including my top 15 at each vendor, so I added two more. You can always go back and add more matches if necessary. Just keep in mind that the smaller the match, the greater the probability that it came from increasingly distant generations before your grandparents. Your sweet spot to identify grandparents is between 1C and 2C.

I need to divide my close matches into 4 groups, each one equating to a grandparent. Record this on your spreadsheet.

You can group your matches at Ancestry using colored dots, which means you can sort by those groups.

You can also select a “side” for a match by clicking on “Yes” under the question, “Do you recognize them?”

Initially, you want to determine if this person is related to you on your mother’s or father side, and hopefully, through which grandparent.

Recently, Ancestry added a feature called SideView which allows testers to indicate, based on ethnicity, which side is “parent 1” and which side is “parent 2.” I wrote about that, here.

Make your selection, assuming you can tell which “side” of you descends from which parent based on ethnicity and/or shared matches. How you label “parent 1,” meaning either maternal or paternal, determines how Ancestry assigns your matches, when possible.

Using these tools, which may not be completely accurate, plus shared matches with people you can identify, divide your matches among your three known grandparents, meaning that the people you cannot assign will be placed in the fourth “unknown” column.

On my spreadsheet, I assign all of my closest matches to one of my grandparents. Michael is my first cousin (1C) and we share both maternal grandparents, so he’s not helpful in the division because he can’t be assigned to only one grandparent.

The green maternal grandfather is who I’m attempting to identify.

There are 4 people, highlighted in yellow, who don’t fall into the other three grandparent lines, so they get added to the green column and will be my focus.

I would be inclined to continue adding matches using a process known as the Leeds Method, until I had several people in each category. Looking back at the DNAPainter cM chart, at this point, we don’t have anyone below 200 cM and the matches we need might be below that threshold. The more matches you have to work with, the better.

At Ancestry, you cannot download your matches into a spreadsheet, nor can you work with other clustering tools such as Genetic Affairs, so you’ll have to build out your spreadsheet manually.

Check for the same types of information that I reviewed at 23andMe:

  • Review trees, if your matches have them, minimally recording the surnames of their 8 great-grandparents.
  • Review shared matches, looking for common names in the trees in recent generations.
  • View shared matches with people with whom you have a “Common Ancestor” indication, which means a ThruLine. You won’t have Thrulines with your target grandparent, of course, but Thrulines will allow you to place the match in one of the other columns. I wrote about ThruLines here, here and here.
  • ThruLines sometimes suggests ancestors based on other people’s trees, so be EXCEEDINGLY careful with potential ancestor suggestions. That’s not to say you should discount those suggestions. Just treat them as tree hints that may have been copy/pasted hundreds of times, because that’s what they are.

I make notes on each match so I can easily see the connection by scanning without opening the match.

Now, I have a total of 30 entries on my spreadsheet, 15 from 23and Me and 15 from Ancestry.

Why Not Use Autosclusters?

Even with vendors who allow or provide cluster tools, I don’t use an automated autocluster tool at this point. Autocluster tools often omit your closest matches because your closest matches would be in nearly half of all your clusters, which isn’t exactly informative. However, for this purpose, those are the very matches we need to evaluate.

After identifying groups of people that represent the missing grandparent, using our spreadsheet methodology, autoclusters could be useful to identify common surnames and even to compare the trees of our matches using AutoTree, AutoPedigree and AutoKinship. AutoClusters cannot be utilized at Ancestry, but is available through MyHeritage and at GEDmatch, or through Genetic Affairs for 23andMe and FamilyTreeDNA.

Next, let’s move to FamilyTreeDNA.

FamilyTreeDNA

FamilyTreeDNA is the only vendor that provides Family Matching, also known as “bucketing.” FamilyTreeDNA assigns your matches to either a paternal or maternal bucket, or both, based on triangulated matches with someone you’ve linked to a profile in your tree.

The key to Family Matching is to link known Family Finder matches to their profile cards in your tree.

Clicking on the Family Tree link at the top of your personal page allows you to link your matches to the profile cards of your matches.

FamilyTreeDNA utilizes these linked matches to assign those people, and matches who match you and those people, both, on at least one common segment, to the maternal or paternal tabs on your match list.

Always link as many known people as possible (red stars) which will result in more matches being bucketed and assigned to parents’ sides for you, even if neither parent is available to test.

I wrote about Triangulation in Action at FamilyTreeDNA, here.

You can see at the top of my match list that I have a total of 8000 matches of which 3422 are paternal, 1517 are maternal and 3 match on both sides. Full siblings, their (and my) children and their descendants will always match on both sides. People with endogamy across both parents may have several matches on both sides.

If your relevant parent has tested, always work from their test.

Because we are searching for the maternal grandfather, in this case, we can ignore all tests that are bucketed as paternal matches.

Given that we are searching for my maternal grandfather, I probably have not been able to link as many maternal matches, other than possibly ones from my maternal grandmother. This means that the maternal grandfather’s matches are not bucketed because there are no identified matches to link on that side of my tree.

If you sort by maternal and paternal tabs, you’ll miss people who aren’t bucketed, meaning they have no maternal or paternal icon, so I recommend simply scanning down the list and processing maternal matches and non-bucketed matches.

By being able to confidently ignore paternally bucketed matches and only processing maternal and non-assigned matches, this is equivalent to processing the first 48 total matches. If I were to only look at the first 15 matches, 12 were paternal and only 3 are maternal.

Using bucketing at FamilyTreeDNA is very efficient and saves a lot of work.

Omitting paternal matches also means we are including smaller matches which could potentially be from common ancestors further back in the tree. Or, they could be younger testers. Or simply smaller by the randomness of recombination.

FamilyTreeDNA is a goldmine, with 16 of 20 maternal matches being from the unknown maternal grandfather.

Next, let’s see what’s waiting at MyHeritage.

MyHeritage

MyHeritage is particularly useful if your lineage happens to be from Europe. Of course, if you’re searching for an unknown person, you probably have no idea where they or their ancestors are from. Two of my best matches first appeared at MyHeritage.

Of course, your matches with people who descend from your unknown maternal grandfather won’t have any Theories of Family Relativity, as that tool is based on BOTH a DNA match plus a tree or document match. However, Theories is wonderful to group your matches to your other three grandparents.

MyHeritage provides a great deal of information for each match, including common surnames with your tree. If you recognize the surnames (and shared matches) as paternal or maternal, then you can assign the match. However, the matches you’re most interested in are the highest matches without any surnames in common with you – which likely point to the missing maternal grandfather.

However, those people may, and probably do, have surnames in common with each other.

Of the matches who aren’t attributed to the other three grandparents, the name Ferverda arises again and again. So does Miller, which suggests the grandparent or great-grandparent couple may well be Ferverda/Miller.

Let’s continue working through the process with our spreadsheet and see what we can discover about those surnames.

Our 60 Results

Of the 60 total results, 15 from each vendor, a total of 24 cannot be assigned to other columns through bucketing or shared matches, so are associated with the maternal grandfather. Of course, Michael who descends from both of my maternal grandparents won’t be helpful initially.

Cheryl, Donald and Michael are duplicates at different vendors, but the rest are not.

Of the relevant matches, the majority, 12 are from FamilyTreeDNA, four each are from Ancestry and MyHeritage, and three are from 23andMe.

Of the names provided in the surname fields of matches, in matches’ trees in the first few generations, and the testers’ surnames, Ferverda is repeated 12 times, for 50% of the time. Miller is repeated 9 times, so it’s likely that either of those are the missing grandfather’s surname. Of course, if we had Y-DNA, we’d know the answer to that immediately.

Comparing trees of my matches, we find John Ferverda as the common ancestor between two different matches. John is the son of Hiram Ferverda and Eva Miller who are found in several trees.

That’s a great hint. But is this the breakthrough I need?

What’s Next?

The next step is to look for connections between the maternal grandmother, Edith Lore, who is known in our example, and a Ferverda male. He is probably one of the sons of Hiram Ferverda and Eva Miller. Do they lived in the same area? In close proximity? Do they attend the same church or school? Are they neighbors or live close to the family or some of their relatives? Does she have connections with Ferverda family members? We are narrowing in.

Some of Hiram and Eva’s sons might be able to be eliminated based on age or other factors, or at least be less likely candidates. Any of their children who had moved out of state when the child was conceived would be less likely candidates. Age would be a factor, as would opportunity.

Target testing of the Ferverda sons’ children, or the descendants of their children would (probably) be able to pinpoint which of their sons is more closely related to me (or my mother) than the rest.

In our case, indeed, John Ferverda is the son we are searching for and his descendant, Michael is the highest match on the list. Cheryl and Donald descend from John’s brother, which eliminates him as a candidate. Another tester descends from a third Ferverda son, which eliminates that son as well.

Michael, my actual first cousin with a 755 cM match at one vendor, and 822 cM at a second vendor, is shown by the MyHeritage cM Explainer with an 88% probability that he is my first cousin.

However, when I’m trying to identify the maternal grandfather, which is half of that couple, I need to focus one generation further back in time to eliminate other candidates.

The second and third closest matches are both Donald at 395 cM and Cheryl at 467 cM who also share the same Ferverda/Miller lineage and are the children of my maternal grandfather’s brother.

On the spreadsheet, I need to look at the trees of people who have both Ferverda and Miller, which brought me to both Cheryl and Donald, then Michael, which allowed me to identify John Ferverda, unquestionably, as my grandfather based on the cM match amounts.

Cheryl and Donald, who are confirmed full siblings, and my mother either have to be first cousins, or half siblings. Their match with mother is NOT in the half-sibling range for one sibling, and on the lower edge with the other. Mother also matches Michael as a nephew, not more distantly as she would if he were a first cousin once removed (1C1R) instead of a nephew.

Evaluating these matches combined confirms that my maternal grandfather is indeed John Ferverda.

What About X DNA?

The X chromosome has a unique inheritance path which is sometimes helpful in this circumstance, especially to males.

Women inherit an X chromosome from both parents, but males inherit an X chromosome from ONLY their mother. A male inherits a Y chromosome from his father which is what makes him male. Women inherit two X chromosomes, one from each parent, and no Y, which is what makes them female.

Therefore, if you are a male and are struggling with which side of your tree matches are associated with, the X chromosome may be of help.

Your mother passed her X chromosome to you, which could be:

  • Her entire maternal X, meaning your maternal grandmother’s X chromosome
  • Her entire paternal X, meaning your maternal grandfather’s X chromosome (which descends from his mother)
  • Some combination of your maternal grandmother and maternal grandfather’s chromosomes

One thing we know positively is that a male’s X matches are ALWAYS from their maternal side only, so that should help when dividing a male’s matches maternally or paternally. Note – be aware of potential pedigree collapse, endogamy and identical-by-chance matches if it looks like a male has a X match on his father’s side.

Unfortunately, the X chromosome cannot assist females in the same way, because females inherit an X from both parents. Therefore, they can match people in the same was as a male, but also in additional ways.

  • Females will match their paternal grandmother on her entire X chromosome, and will match one or both of their maternal grandparents on the X chromosome.
  • Females will NEVER match their paternal grandfather’s X chromosome because their father did not inherit an X chromosome from his father.
  • Males will match one or both of their maternal grandparents on their X chromosome.
  • Males will NEVER match their paternal grandparents, because males do not receive an X chromosome from their father.

The usefulness of X DNA matching depends on the inheritance path of both the tester AND their match.

When Can Y-DNA or Mitochondrial DNA Help with Grandparent Identification?

If you recall, I selected the maternal grandfather as the person to seek because no tester carries either the Y-DNA or mitochondrial DNA of their maternal grandfather. In other words, this was the most difficult identification, meaning that any of the other three grandparents would be, or at least could be, easier with the benefit of Y-DNA and/or mitochondrial DNA testing.

In addition to matching, both Y-DNA and mitochondrial DNA will provide testers with location origins, both continental and often much more specific locations based on where other testers and matches are from.

Y-DNA often provides a surname.

Let’s see how these tests, matches and results can assist us.

  • Paternal grandfather – If I was a male descended from John Ferverda paternally, I could have tested both my autosomal DNA PLUS my Y-DNA, which would have immediately revealed the Ferverda surname via Y-DNA. Two Ferverda men are shown in the Ferverda surname DNA project, above.

That revelation would have confirmed the Ferverda surname when combined with the high frequency of Ferverda found among autosomal matches on the spreadsheet.

  • Maternal grandmother – If we were searching for a maternal grandmother, both the male and female sibling testers (as shown in the pedigree chart) would have her mitochondrial DNA which could provide matches to relevant descendants. Mitochondrial DNA at both FamilyTreeDNA and 23andMe could also eliminate anyone who does not match on a common haplogroup, when comparing 23andMe results to 23andMe results, and FamilyTreeDNA to FamilyTreeDNA results at the same level.

At 23andMe, only base level haplogroups are provided, but they are enough to rule out a direct matrilineal line ancestor.

At FamilyTreeDNA, the earlier HVR1 and HVR2 tests provide base level haplogroups, while full sequence testing provides granular, specific haplogroups. Full sequence is the recommended testing level.

  • Paternal grandmother – If we were searching for a paternal grandmother, testers would, of course, need either their father to test his mitochondrial DNA, or for one of his siblings to test which could be used in the same way as described for maternal grandmother matching.

Summary

Successfully identifying a grandparent is dependent on many factors. Before you make that identification, it’s very difficult to know which are more or less important.

For example, if the grandparent is from a part of the world with few testers, you will have far fewer matches, potentially, than other lines from more highly tested regions. In my case, two of my four grandparents’ families, including Ferverda, immigrated in the 1850s, so they had fewer matches than families that have been producing large families in the US for generations.

Endogamy may be a factor.

Family size in past and current generations may be a factor.

Simple luck may be a factor.

Therefore, it’s always wise to test your DNA, and that of your parents and close relatives if possible, and upload to all of the autosomal databases. Then construct an analysis plan based on:

  • How you descend from the grandparent in question, meaning do you carry their X DNA, Y-DNA or mitochondrial DNA.
  • Who else is available to test their autosomal DNA to assist with shared matches and the process of elimination.
  • Who else is available to test for Y-DNA and/or mitochondrial DNA of the ancestor in question.

If you don’t find the answer initially, schedule a revisit of your matches periodically and update your spreadsheet. Sometimes DNA and genealogy is a waiting same.

Just remember, luck always favors the prepared!

Resources

You may find the following resource articles beneficial in addition to the links provided throughout this article.

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X Chromosome Master Class

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13

The X chromosome can be especially useful to genetic genealogists because it has a unique inheritance path. Thanks to that characteristic, some of the work of identifying your common ancestor is done just by simply HAVING an X match.

Unfortunately, X-DNA and X matching is both underutilized and somewhat misunderstood – in part because not all vendors utilize the X chromosome for matching.

The X chromosome has the capability of reaching further back in time and breaking down brick walls that might fall no other way.

Hopefully, you will read this article, follow along with your own DNA results and make important discoveries.

Let’s get started!

Who Uses the X Chromosome?

The X chromosome is autosomal in nature, meaning it recombines under some circumstances, but you only inherit your X chromosome from certain ancestors.

It’s important to understand why, and how to utilize the X chromosome for matching. In this article, I’ve presented this information in a variety of ways, including case studies, because people learn differently.

Of the four major testing vendors, only two provide X-DNA match results.

  • FamilyTreeDNA – provides X chromosome results and advanced matching capabilities including filtered X matching
  • 23andMe – provides X chromosome results, but not filtered X matching without downloading your results in spreadsheet format
  • Ancestry and MyHeritage do not provide X-DNA results but do include the X in your raw DNA file so you can upload to vendors who do provide X matching
  • GEDmatch – not a DNA testing vendor but a third-party matching database that provides X matching in addition to other tools

It’s worth noting at this point that X-DNA and mitochondrial DNA is not the same thing. I wrote about that, here. The source of this confusion is that the X chromosome and mitochondrial DNA are both associated in some way with descent from females – but they are very different and so is their inheritance path.

So, what is X-DNA and how does it work?

What is X-DNA?

Everyone inherits two copies of each of chromosomes 1-22, one copy of each chromosome from each of your parents.

That’s why DNA matching works and each match can be identified as “maternal” or “paternal,” depending on how your match is related to you. Each valid match (excluding identical by chance matches) will be related either maternally, or paternally, or sometimes, both.

Your 23rd chromosome is your sex determination chromosome and is inherited differently. Chromosome 23 is comprised of X and Y DNA.

Everyone inherits one copy of chromosome 23 from each parent.

  • Males inherit a Y chromosome from their father, which is what makes males male. They do not inherit an X chromosome from their father.
  • Males always inherit an X chromosome from their mother.
  • Females inherit an X chromosome from both parents, which is what makes them female. Females have two X chromosomes, and no Y chromosome.
Chromosome 23 Father Contributes Mother Contributes
Male Child Y chromosome X chromosome
Female Child X chromosome X chromosome

X-DNA and mitochondrial DNA are often confused, but they are not the same thing. In fact, they are completely different.

Mitochondrial DNA, in BOTH males and females is always inherited from only the mother and only descends from the direct matrilineal line, so only the mother’s mother’s mother’s direct line. X DNA can be inherited from a number of ancestors based on a specific inheritance path.

Everyone has both X-DNA AND mitochondrial DNA.

Because males don’t inherit an X chromosome from their father, X chromosome matching has a unique and specific pattern of descent which allows testers who match to immediately eliminate some potential common ancestors.

  • Males only inherit an X chromosome from their mother, which means they can only have legitimate X matches on their mother’s side of their tree.
  • Females, on the other hand, inherit an X chromosome from both their mother and father. Their father only has one X chromosome to contribute, so his daughter receives her paternal grandmother’s X chromosome intact.
  • Both males and females inherit their mother’s X chromosome just like any of the other 22 autosomes. I wrote about chromosomes, here.

However, the unique X chromosome inheritance path provides us with a fourth very useful type of DNA for genealogy, in addition to Y-DNA, mitochondrial and autosomal DNA.

For the vendors who provide X-matching, it’s included with your autosomal test and does not need to be purchased separately.

The Unique X Chromosome

The X chromosome, even though it is autosomal in nature, meaning it does recombine and divide in certain circumstances, is really its own distinct tool that is not equivalent to autosomal matching in the way we’re accustomed. We just need to learn about the message it’s delivering and how to interpret X matches.

FamilyTreeDNA is one of two vendors who utilizes X chromosome matching, along with 23andMe, which is another good reason to encourage your matches at other vendors to upload their DNA file to FamilyTreeDNA for free matching.

The four major vendors do include X-DNA results in their raw DNA download file, even if they don’t provide X-matching themselves. This means you can upload the results to either FamilyTreeDNA or GEDmatch where you can obtain X matches. I provided step-by-step download/upload instructions for each vendor here.

Let’s look how X matching is both different, and beneficial.

My X Chromosome Family Tree

We are going to build a simple case study. A case study truly is worth 1000 descriptions.

This fan chart of my family tree colorizes the X chromosome inheritance path. In this chart, males are colored blue and females pink, but the salient point is that I can inherit some portion of (or all of) a copy of my X chromosome from the colorized ancestors, and only those ancestors.

Because males don’t inherit an X chromosome from their father, they CANNOT inherit any portion of an X chromosome from their father’s ancestors.

Looking at my father’s half of the chart, at left, you see that I inherited an X chromosome from both of my parents, but my father only inherited an X chromosome from his mother, Ollie Bolton. His father’s portion of the tree is uncolored, so no X chromosome could have descended from his paternal ancestors to him. Therefore he could not pass any X chromosome segments to me from his paternal side – because he doesn’t have X DNA from his father.

Hence, I didn’t inherit an X chromosome from any of the people whose positions in the chart are uncolored, meaning I can only inherit an X chromosome from the pink or blue people.

Essentially any generational male to male, meaning father/son relationship is an X-DNA blocker.

I know positively that I inherited my paternal grandmother, Ollie Bolton’s entire X chromosome, because hers is the only X chromosome my father, in the fan chart above, had to give me. His entire paternal side of the fan chart is uncolored.

Men only ever inherit their X chromosome from their mother. The only exception to this is if a male has the rare genetic condition of Klinefelter Syndrome, also known as XXY. If you are an adult male, it’s likely that you’ll already know if you have Klinefelters, so that’s probably the last possibility you should consider if you appear to have paternal X matches, not the first.

Sometimes, men appear to have X matches on their father’s side, but (barring Klinefelter’s) this is impossible. Those matches must either be identical by chance, or somehow related in an unknown way on their mother’s side.

Everyone inherits an X chromosome from their mother that is some combination of the X from her father and mother. It’s possible to inherit all of your maternal grandmother or maternal grandfather’s X chromosome, meaning they did not recombine during meiosis.

Using DNA Painter as an X Tool

I use DNAPainter to track my matches and correlate segments with ancestors.

I paint my DNA segments for all my chromosomes at DNAPainter which provides me with a central tracking mechanism that is visual in nature and allows me to combine matches from multiple vendors who provide segment information. I provide step-by-step instructions for using DNAPainter, here.

This is my maternal X chromosome with my matches painted. I’ve omitted my matches’ names for privacy.

On the left side of the shaded grey column, those matches are from my maternal grandmother’s ancestors. On the right side, those matches are from my maternal grandfather’s ancestors.

The person in the grey column descends from unknown ancestors. In other words, I can tell that they descend from my maternal line, but I can’t (yet) determine through which of my two maternal grandparents.

There’s also an area to the right of the grey column where there are no matches painted, so I don’t know yet whether I inherited this portion of my X chromosome from my maternal grandmother or maternal grandfather.

The small darker pink columnar band is simply marking the centromere of the chromosome and does not concern us for this discussion.

Click on any image to enlarge

In this summary view of my paternal X chromosome, above, it appears that I may well have inherited my entire X chromosome from my paternal great-grandmother. We know, based on our inheritance rules that I clearly received my paternal grandmother’s X chromosome, because that’s all my father had to give me.

However, by painting my matches based on their ancestors, and selecting the summary view, you can see that most of my paternal X chromosome can be accounted for, with the exception of rather small regions with the red arrows.

It’s not terribly unusual for either a male or female to inherit their entire maternal X chromosome from one grandparent, or in this case, great-grandparent.

Of course, a male doesn’t inherit an X chromosome from their father, but a female can inherit her paternal X chromosome from either or both paternal grandparents.

Does Size Matter?

Generally speaking, an X match needs to be larger than a match on the other chromosomes to be considered genealogically equivalent in the same timeframe as other autosomal matches. This is due to:

  • The unique inheritance pattern, meaning fewer recombination events occurred.
  • The fact that X-DNA is NOT inherited from several lines.
  • The X chromosome has lower SNP density, meaning it contains fewer SNPs, so there are fewer possible locations to match when compared to the other chromosomes.

I know this equivalency requirement sounds negative, but it’s actually not. It means 7 cM (centimorgans) of DNA on the X chromosome will reach back further in time, so you may carry the DNA of an ancestor on the X chromosome that you no longer carry on other chromosomes. It may also mean that older segments remain larger. It’s actually a golden opportunity.

It sounds much more positive to say that a 16 cM X match for a female, or a 13 cM X match for a male is about the same as a 7 cM match for any other autosomal match in the same generation.

Of course, if the 7 cM match gets divided in the following generation, it has slipped below the matching threshold. If a 16 or 13 cM X match gets divided, it’s still a match. Plus, in some generations, if passed from father to daughter, it’s not divided or recombined. So a 7 cM X match may well be descended from ancestors further back in time.

X Chromosome Differences are Important!

Working with our great-great grandparent’s generation, we have 16 direct ancestors as illustrated in the earlier fan chart.

Given that females inherit from 8 X-chromosome ancestors in total, they are going to inherit an average of 45.25 cM of X-DNA from each of those ancestors. Females have two X chromosomes for a total length of 362 cM of X-DNA from both parents.

A male only has one X chromosome, 181 cM in length, so he will receive an average of 36.2 cM from each of 5 ancestors, and it’s all from his mother’s side.

In this chart, I’ve shown the total number of cMs for all of the autosomes, meaning chromosomes 1-22 and, separately, the X for males and females.

  • The average total cM for chromosomes 1-22 individually is 304 cM. (Yes, each chromosome is a different length, but that doesn’t matter for averages.)
  • That 304 cM can be inherited from any of 16 ancestors (in your great-grandparent’s generation)
  • The total number of cM on the X chromosomes for both parents for females totals 362
  • The total cM of X-DNA for males is 181 cM
  • The calculated average cM inherited for the X chromosome in the same generation is significantly different, shown in the bottom row.

The actual average for males and females for any ancestor on any random non-X chromosome (in the gg-grandparent generation) is still 19 cM. Due to the inheritance pattern of the X chromosome, the female X-chromosome average inheritance is 45.25 cM and the male average is 36.2 cM, significantly higher than the average of 19 cM that genetic genealogists have come to expect at this relationship distance on the other chromosomes, combined.

How Do I Interpret an X Match?

It’s important to remember when looking at X matching that you’re only looking at the amount of DNA from one chromosome. When you’re looking at any other matching amount, you’re looking at a total match across all chromosomes, as reported by that vendor. Vendors report total matching DNA differently.

  • The total amount of matching autosomal DNA does not include the X chromosome cMs at FamilyTreeDNA. X-DNA matching cMs are reported separately.
  • The total amount of matching autosomal DNA does include the X chromosome cMs in the total cM match at 23andMe
  • X-DNA is not used for matching or included in the match amount at either MyHeritage or Ancestry, but is included in the raw DNA data download files for all four vendors.
  • The total match amount shows the total for 22 (or 23) chromosomes, NOT just the X chromosome(s). That’s not apples to apples.

Therefore, an X match of 45 cM for a female or 36 for a male is NOT (necessarily) equivalent to a 19 cM non-X match. That 19 cM is the total for 22 chromosomes, while the X match amount is just for one chromosome.

You might consider a 20 cM match on the regular autosomes significant, but a 20 cM X-only match *could* be only roughly equivalent to a 10ish cM match on chromosomes 1-22 in the same generation. That’s the dog-leg inheritance pattern at work.

This is why FamilyTreeDNA does not report an X-only match if there is no other autosomal match. A 19 cM X match is not equivalent to a 19cM match on chromosomes 1-22. Not to mention, calculating relationships based on cM ranges becomes more difficult when the X is included.

However, the flip side is that because of the inheritance pattern of the X chromosome, that 19 cM match, if valid and not IBC, may well reach significantly further back in time than a regular autosomal matches. This can be particularly important for people seeking either Native or enslaved African ancestors for whom traditional records are elusive if they exist at all.

Critical Take-Away Messages

Here are the critical take-away messages:

  1. Because there are fewer ancestral lineages contributing to the tester’s X chromosome, the amount of X chromosomal DNA that a tester inherits from the ancestors who contribute to their X chromosome is increased substantially.
  2. The DNA of the contributing ancestors is more likely to be inherited, because there are fewer other possible contributing ancestors, meaning fewer recombination events or DNA divisions/recombinations.
  3. X-DNA is also more likely to be inherited because when passed from mother to son, it’s passed intact and not admixed with the DNA of the father.
  4. X matches cannot be compared equally to either percentages or cM amounts on any of the other chromosomes, or autosomal DNA in total, because X matching only reports the amount on one single chromosome, while your total cM match amount reports the amount of DNA that matches from all chromosomes (which includes the X at 23andMe).
  5. If you have X matches at 23andMe and/or FamilyTreeDNA, you can expect your total matching to be higher at 23andMe because they include the X matching cM in the total amount of shared DNA. FamilyTreeDNA provides the amount of X matching DNA separately, but not included in the total. MyHeritage and Ancestry do not include X matching DNA.

For clarity, at FamilyTreeDNA, you can see my shared DNA match with my mother. Of course, I match her on the total length of all my chromosomes, which is 3563 cM, the total Shared DNA for chromosomes 1-22. This includes all chromosomes except for the X chromosome which is reported separately at 181 cM. The longest contiguous block of shared DNA is 284 cM, the entire length of chromosome 1, the longest chromosome.

Because I’m a female, I match both parents on the full length of all 23 chromosomes, including 181 cM on both X chromosomes, respectively. Males will only match their mother on their X chromosome, meaning their total autosomal DNA match to their father, because the X is excluded, is 181 cM less than to their mother.

This difference in the amount of shared DNA with each parent, plus the differences in how DNA totals are reported by various vendors is also challenging for tools like DNAPainter’s Shared cM Tool which is based on the crowd sourced Shared cM Project that averages shared DNA numbers for known relationships at various vendors and translates those numbers into possible relationships for unknown matches.

Not all vendors report their total amount of shared DNA the same way. This is true for both X-DNA and half identical (HIR) versus fully identical (FIR) segments at 23andMe. This isn’t to say either approach is right or wrong, just to alert you to the differences.

Said Another Way

Let’s look at this another way.

If the average on any individual chromosome is 19 cMs for a relationship that’s 5 generations back in time. The average X-DNA for the same distance relationship is substantially more, which means that:

  • The X-DNA probably reaches further back in time than an equivalent relationship on any other autosome.
  • The X-DNA will have (probably) divided fewer times, and more DNA will descend from individual ancestors.
  • The inheritance path, meaning potential ancestors who contributed the X chromosomal DNA, is reduced significantly.

It’s challenging to draw equivalences when comparing X-DNA matching to the other chromosomes due to several variables that make interpretation difficult.

Based on the X-match size in comparison to the expected 19 cM single chromosome match at this genealogical distance, what is the comparable X-DNA segment size to the minimum 7 cM size generally accepted as valid on other chromosomes? What would be equal to a 7 cM segment on any other single random autosomal match, even though we know the inheritance probabilities are different and this isn’t apples to apples? Let’s pretend that it is.

This calculation presumes at the great-great-grandparent level that the 19 cM is in one single segment on a single chromosome. Now let’s divide 19 cM by 7 cM, which is 2.7, then divide the X amounts by the same number for the 7 cM equivalent of 16.75 cM for a female and 13.4 cM for a male.

When people say that you need a “larger X match to be equivalent to a regular autosomal match,” this is the phenomenon being referenced. Clearly a 7 cM X match is less relevant, meaning not equivalent, in the same generation as a 7 cM regular autosomal match.

Still, X matching compared to match amounts shown on the other chromosomes is never exact;u apples to apples because:

  • You’re comparing one X chromosome to the combined DNA amounts of many chromosomes.
  • The limited recombination path.
  • DNA from the other autosomes is less likely to be inherited from a specific ancestor.
  • The X chromosome has a lower SNP density than the other chromosomes, meaning fewer SNPs per cM.
  • The X-DNA may well reach further back in time because it has been divided less frequently.

Bottom Line

The X chromosome is different and holds clues that the other autosomes can’t provide.

Don’t dismiss X matches even if you can’t identify a common ancestor. Given the inheritance path, and the reduced number of divisions, your X-DNA may descend from an ancestor further back in time. I certainly would NOT dismiss X matches with smaller cMs than the 13 and 16 shown above, even though they are considered “equivalent” in the same generation.

X chromosome matching can’t really be equated to matching on the other chromosomes. They are two distinct tools, so they can’t be interpreted identically.

Different vendors treat the X chromosome differently, making comparison challenging.

  • 23andMe includes not only the X chromosome in their cM total, but doubles the Fully Identical Regions (FIR) when people, such as full siblings, share the same DNA from both parents. I wrote about that here.
  • Ancestry does not include the X in their cM match calculations.
  • Neither does MyHeritage.
  • FamilyTreeDNA shows an X match only when it’s accompanied by a match on another chromosome.

The Shared cM Project provides an average of all of the data input by crowdsourcing from all vendors, by relationship, which means that the cM values for some relationships are elevated when compared to the same relationship or even same match were it to be reported from a different vendor.

The Best Part!

The X chromosome inheritance pattern means that you’re much more likely to carry some amount of a contributing ancestor’s X-DNA than on any other chromosome.

  • X-DNA may well be “older” because it’s not nearly as likely to be divided, given that there are fewer opportunities for recombination.
  • When you’re tracking your X-DNA back in your tree, whenever you hit a male, you get an automatic “bump” back a generation to his mother. It’s like the free bingo X-DNA square!
  • You can immediately eliminate many ancestors as your most recent common ancestor (MRCA) with an X-DNA match.
  • Because X-DNA reaches further back in time, sometimes you match people who descend from common ancestors further back in time as well.

If you match someone on multiple segments, if one of those matching segments is X-DNA, that segment is more likely to descend from a different ancestor than the segments on chromosomes 1-22. I’ve found many instances where an X match descends from a different ancestor than matching DNA segments on the autosomes. Always evaluate X matches carefully.

Sometimes X-DNA is exactly what you need to solve a mystery.

Ok, now let’s step through how to use X-DNA in a real-life example.

Using X DNA to Solve a Mystery

Let’s say that I have a 30 cM X match with a male.

  • I know immediately that our most recent common ancestor (MRCA) is on HIS mother’s side.
  • I know, based on my fan chart, which ancestral lines are eliminated in my tree. I’ve immediately narrowed the ancestors from 16 to 5 on his side and 16 to 8 on my side.
  • Two matching males is even easier, because you know immediately that the common ancestor must be on both of their mother’s sides, with only 5 candidate lines each at the great-great-grandparent generation.

Female to female matches are slightly more complex, but there are still several immediately eliminated lines each. That means you’ve already eliminated roughly half of the possible relationships by matching another female on their X chromosome.

In this match with a female second cousin, I was able to identify who she was via our common ancestor based on the X chromosome path. In this chart, I’m showing the relevant halves of her chart at left (paternal), and mine (maternal), side by side.

I added blockers on her chart and mine too.

As it turns out, we both inherited most of our X chromosome from our great-grandparents, marked above with the black stars.

Several lines are blocked, and my grandfather’s X chromosome is not a possibility because the common ancestor is my maternal grandmother’s parents. My grandfather is not one of her ancestors.

Having identified this match as my closest relative (other than my mother) to descend on my mother’s maternal side, I was able to map that portion of my X chromosome to my great-grandparents Nora Kirsch and Curtis Benjamin Lore.

My X Chromosome at DNA Painter

Here’s my maternal X chromosome at DNAPainter and how I utilized chromosome painting to push the identification of the ancestors whose X chromosome I inherited back an additional two generations.

Using that initial X chromosome match with my second cousin, shown by the arrow at bottom of the graphic, I mapped a large segment of my maternal X chromosome to my maternal great-grandparents.

By viewing the trees of subsequent X maternal matches, I was then able to push those common segments, shown painted directly above that match with the same color, back another two generations, to Joseph Hill, born in 1790, and Nabby Hall. I was able to do that based on the fact that other matches descend from Joseph and Nabby through different children, meaning we all triangulate on that common segment. I wrote about triangulation at DNAPainter, here.

I received no known X-DNA from my great-grandmother, Nora Kirsch, although a small portion of my X chromosome is still unassigned in yellow as “Uncertain.”

I received a small portion of my maternal X chromosome, in magenta, at left, from my maternal great-great-grandparents, John David Miller and Margaret Lentz.

The X chromosome is a powerful tool and can reach far back in time.

In some cases, the X, and other chromosomes can be inherited intact from one grandparent. I could have inherited my mother’s entire copy of her mother’s, or her father’s X chromosome based on random recombination, or not. As it turns out, I didn’t, and I know that because I’ve mapped my chromosomes to identify my ancestors based on common ancestors with my matches.

X-DNA Advanced Matches at FamilyTreeDNA

At FamilyTreeDNA, the Advanced Matches tab includes the ability to search for X matches, either within the entire database, or within specific projects. I find the project selection to be particularly useful.

For example, within the Claxton project, my father’s maternal grandmother’s line, I recognize my match, Joy, which provides me an important clue as to the possible common ancestor(s) of our shared segments.

Joy’s tree shows that her 4-times great-grandparents are my 3-times great-grandparents, meaning we are 4th cousins once removed and share 17 cM of DNA on our X chromosome across two segments.

Don’t be deceived by the physical appearance of “size” on your chromosomes. The first segment that spans the centromere, or “waist” of the chromosome, above, is 10.29 cM, and the smaller segment at right is 7.02 cM. SNPs are not necessarily evenly distributed along chromosomes.

Remember, an X or other autosomal match doesn’t necessarily mean the entire match is contained in one segment so long as it’s large enough to be divided in two parts and survive the match threshold.

It’s worth noting that Joy and I actually share at least two different, unrelated ancestral lines, so I need to look at Joy’s blocked lines to see if one of those common ancestral lines is not a possibility for our X match. It’s important to evaluate all possible ancestors, plus the inheritance path to eliminate any lineage that involves a father to son inheritance on the X chromosome.

Last but not least, you may match on your X chromosome through a different ancestor than on other chromosomes. Every matching segment has its own individual history. It’s not safe to assume.

Now, take a look at your X chromosome matches at FamilyTreeDNA, 23andMe, and GedMatch. What will you discover?

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Relatives at RootsTech – How to Use & Connect with DNA

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Relatives at RootsTech is back and I’m so very glad to see it.

Let me show you how to use this wonderful tool, including tips for how to get even more out of the experience.

It’s important to start now to accumulate your cousins, because there’s a display limit of 300 in each category, so you’ll want to begin recording your findings so that as more people sign up and are added to your list, you don’t “lose” the earlier relatives.

Let’s start with my link. Click here.

You’ll be prompted to sign in to your FamilySearch account, or create one. If you don’t have an account, create one now.

Right now, the number of participants is doubling every few days.

Let’s take a look at how Relatives at RootsTech works and how it can benefit you.

Surnames

At first glance, the surname tool doesn’t look terribly exciting, but there’s a hidden gem, especially for newer genealogists.

I entered my surname and one other, knowing there is probably no common locations other than the US. Kvochick is very rare and unique.

The results show two interesting things. First, the genesis of the surname, and second, the total number of people in the FamilySearch tree in both of the common locations for both surnames.

Be sure to try variant spellings too.

After you sign in, you’ll be asked to update your profile which is how you join in on the fun. If you signed up for Relatives at RootsTech last year, that doesn’t count for this year. You need to opt-in for this year’s festivities.

RootsTech Relatives

After you sign in, you’ll see how many of your relatives have joined.

Of the 60,461 total who have joined, according to the FamilySearch tree, I’m related to about 15% of them. That sure gives new perspective to how many people we’re related to. And just think if those brick walls didn’t exist. We’d be related to just about everyone. Far enough back, we’re all related, literally.

Your Relatives at RootsTech are displayed in three ways.

By location, ancestor or family line.

Relatives by Location

Your first view will be by all locations (including people who did not select a location,) but displayed in closest to most distant relationship order. For me, that’s the most interesting part.

These people, my closest relatives, are the people most likely to have critical pieces of information that I don’t have or know about. Like family stories, or photos, for example.

I know one of these people, but not the rest. I’m dying to know who they are and how we are related.

For me, the map itself isn’t terribly useful, but it would be if some members of your family were from distinct locations.

Not everyone opts in to have their location displayed. The “173” in the center is the people who generically selected United States.

Relatives by Family Line

The Family Line display shows you the number of people by parent or grandparent. Unfortunately, you can only view 300 of your matches in each line, which is disappointing.

However, there’s a better way to view your relatives.

Relatives by Ancestor

For me, the best way to view relatives is by ancestor. This also circumvents the 300 limit to some extent, unless you have more than 300 relatives for any one ancestor.

I have two relatives who also descend from Curtis Benjamin Lore. It’s Jen and Jill again, my closest relatives.

I’m quite interested in these people, because Curtis is my great-grandfather and he was a very interesting man. I know Jen and Jill are interested in genealogy too, or they would not have signed up for RootsTech Relatives, this year, in the past few days. This is not a stale list.

I’ll be messaging them as soon as I’m finished with this article!!!

Please note that FamilySearch does not label half-relationships accurately.

Jen and Jill are my HALF second cousins twice removed, which will affect the expected amount of shared DNA. Their ancestors, Edith and Maude were half-sisters through their father, not full sisters. One of the reasons I’m so interested in communicating with Jen and Jill is because I’m not at all sure that those half-sisters knew each other existed.

Maintaining Contact

For each relative found, you can view your relationship, message them, or add them to your contact list. Be aware – your contact list “saves” this person, but it does not tell you how you’re related. That’s where either a Word document, with screen shots of how you’re related, or a spreadsheet where you can detail that information is important.

If you have messaged people in the past, those messages are still in your message box in the upper right-hand corner.

I generally provide my email address when I message relatives.

Displaying the Relationship

If you click on the “Relationship” button, you’ll see how FamilySearch believes you’re related to each match.

My relationship with an Acadian cousin, beginning with our common ancestor, is shown above. Grab a screen shot so you can remember. I drop them into a spreadsheet or Word document.

These matches are based on FamilySearch’s one world type of tree. I don’t have to tell you to be cautious because, like any tree, there are erroneous connections. This connection, at least on my side (left hand,) seems to be accurate. I don’t have Jeanne Chebrat’s second marriage to Jehan Piorier in my file, so I’ll need to check that out. Many times FamilySearch, WikiTree, Ancestry, or MyHeritage has connected documents or sources. In this case, here’s the WikiTree entry for Jeanne.

See, I’ve found something interesting already.

Search for People

On the toolbar, if you click on the right arrow, you’ll notice there’s one more option – Search.

If you think one your cousins might be attending, either virtually or in person, you can search by surname. I entered Estes out of curiosity.

This is quite interesting, because some other poor soul is also named Roberta Estes. You KNOW I’ll be messaging her. I’m pretty sure I know who this is, because we’ve been getting mixed up for years. Unless, of course there are actually three of us interested in genealogy.

However, where this Search option really shines is if you’re looking for males who descend from a particular line as candidates for Y-DNA testing.

Bingo!

I suggest doing this name search for each surname in your tree.

The Share Button is Critically Important

Sharing is the key to encouraging people to participate.

This button on the main page is how I generated the link for you to use to see if we’re related.

There’s a “Share” button in several locations. However, you’ll want to be sure you know exactly what you’re sharing. In some cases, it will be the surname comparison information or other information that you’re viewing. 

However, on the bottom of your Relatives pages, Share will generate a message link to/through several programs or apps so people can sign in to see if they are related to you.

You can also just copy the link and send it to someone in a text message or otherwise.

If you generate a message to share, you’ll see what will be posted, so you’ll know for sure exactly what you’re sharing. I wanted to post the link for my friends on Facebook to see if we are related, and that’s exactly what was generated.

If you follow the link to see if we are related, be sure to tell me, or anyone else whose link you follow.

Next, Connect with DNA

Relatives for RootsTech is a wonderful segway into DNA testing.

Remember, with the 300-relative limit, different searches will produce different results including people that won’t be included due to the 300 limit in other searches. Be creative and search in multiple ways. Add your relatives to your spreadsheet or Word document, then record whether they’ve DNA tested, at which vendor(s) and if you match there.

There are various ways to utilize Relatives at RootsTech for DNA.

  • Y-DNA candidates for the direct paternal line for males – The Search by surname can provide you with Y-DNA testing candidates. They may already have tested their Y-DNA with FamilyTreeDNA or their autosomal DNA with at least one vendor, so just message them and ask. Tell them which databases you’re in. Viewing Relatives by Ancestor can be very useful for this same purpose, especially if you have multiple unrelated lines with the same surname.
  • Mitochondrial DNA – the Relatives by Ancestor tool is very useful for locating mitochondrial DNA testing candidates, especially since you can easily see how they are descended from your common ancestor. Mitochondrial DNA is passed from women through all females to the current generation, which can be male or female. Any of your cousins, of either sex, are candidates so long as they descend from your target ancestor through all females.
  • DNA Pedigree Chart – If you’re building your own DNA Pedigree Chart with the Y-DNA and mitochondrial DNA of each ancestral line, consider offering a DNA testing scholarship to people who carry those lines that are missing in your DNA Pedigree Chart.
  • Testing Candidates – Anyone is a good candidate for autosomal testing. No second cousin or closer has ever not matched. Ask your cousins if they have tested and tell them which DNA databases you are in. Furthermore, suggest that they upload their DNA to FamilyTreeDNA and MyHeritage for free to utilize their tools and find matches that aren’t in the other databases. GEDmatch isn’t a testing company, but is another free database where you may find people who tested at Ancestry. Unfortunately, Ancestry does not provide segment information for matching or painting, so hopefully you’ll be able to find your Ancestry matches elsewhere.
  • Databases – Be sure you’re in all of the databases (Ancestry, 23andMe, FamilyTreeDNA, MyHeritage and GEDmatch) so you can be found and you can find your relatives.
  • DNAPainter – If you’re painting your segments at DNAPainter, you can paint your matching segments from 23andMe, FamilyTreeDNA, MyHeritage or GEDmatch. Ancestry is the only vendor that does not provide matching segment information for their customers.
  • DNA Search – If your cousin has used their actual name when registering at FamilySearch, sort by ancestor, then search your DNA matches at the various vendors for that cousin’s name. The beauty of Relatives at RootsTech is that the relationship is already sorted by ancestor, so that piece of the puzzle has already been assembled for you, which is exactly the opposite of most DNA matches. Of course, this does not preclude errors or connections through multiple ancestors.

Limited Time – March 31 is the End

If I had a FamilySearch genie and could get one wish, it would be that they would leave Relatives for RootsTech up and available until the next RootsTech. I need time to work on these relationships.

However, that’s not the case, and Relatives for RootsTech ends on March 31st.

Therefore, it’s important to begin building your spreadsheet, or however you’re going to record your relatives, NOW. Check your list often so none of those precious matches will roll off of your list and become unavailable. Access to the complete relative match list, meaning no 300 limit would be my second wish from the FamilySearch genie.

To preserve the ability to communicate with your relatives, message them now or at least add them to your contact list – WITH A NOTE IN YOUR SPREADSHEET AS TO HOW YOU’RE RELATED. Otherwise, that information will not be available after March 31st.

You’ll want to use the same spreadsheet from year to year, as some of the relatives signing up this year probably did last year too.

Ready, Set, Relatives at RootsTech

Have fun. Be sure to let me know if we’re related and how!!!

____________________________________________________________

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If you haven’t already subscribed (it’s free,) you can receive an email whenever I publish by clicking the “follow” button on the main blog page, here.

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I receive a small contribution when you click on some of the links to vendors in my articles. This does NOT increase the price you pay but helps me to keep the lights on and this informational blog free for everyone. Please click on the links in the articles or to the vendors below if you are purchasing products or DNA testing.

Thank you so much.

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