Concepts – Match Groups and Triangulation

Today, we’re going to talk about the concepts of autosomal DNA and the differences between: Match groups Mathematical triangulation Genealogical triangulation Match Groups At Family Tree DNA, when you download your chromosome matching results, meaning your complete spreadsheet, then sorting into chromosome order (sort … Continue reading

Concepts – Relationship Predictions

One of the ways people utilize autosomal DNA for genealogical matching is by looking for common segments of DNA that match with known, or unknown, relatives.  When the relationship to the person is unknown, we attempt to utilize how much DNA … Continue reading

Concepts – Genetic Distance

At Family Tree DNA, your Y DNA and full sequence mitochondrial matches display a column titled Genetic Distance.  One of the most common questions I receive is how to interpret genetic distance. Many people mistakenly assume that genetic distance is the number of … Continue reading

Concepts – Managing Autosomal DNA Matches – Step 1 – Assigning Parental Sides

Lots of people have struggled with exactly how to identify and work with autosomal DNA matches, create DNA match groups and triangulation groups, which isn’t at all the same thing. Add to that multiple testing vendors who provide you with different types information … Continue reading

Concepts – Downloading Autosomal Data from Family Tree DNA

In the new Concepts series titled Managing Autosomal DNA Matches, we’re going to be working with your DNA information from several sources. In order to create matching spreadsheets, you’ll need to download your autosomal information from Family Tree DNA. Sign … Continue reading

Concepts – Parental Phasing

I recently used a technique called parental phasing as part of the proof that one Curtis Lore found in Pennsylvania was the same person as Curtis Benjamin Lore, found later in Indiana.  Given that I’ve already used parental phasing as part of a … Continue reading

Concepts – CentiMorgans, SNPs and Pickin’ Crab

In autosomal DNA testing, you’ll see the terms centiMorgans, represented as cM and SNPs, which stands for single nucleotide polymorphism, combined. These are two terms that are used to discuss thresholds and measurements of matching amounts of autosomal DNA segments. … Continue reading

Concepts – Identical by…Descent, State, Population and Chance

In genetic genealogy, what does it mean when someone says they are “identical by” something…and what are those various somethings? In autosomal DNA, where your DNA on chromosomes 1-22 (and sometimes X) is compared to other people for matches of … Continue reading

Concepts – How Your Autosomal DNA Identifies Your Ancestors

Welcome to the concepts articles. This series presents the concepts of genetic genealogy, not the details.  I have written a lot of detailed articles, and I’ve linked to them for those of you who want more.  My suggestion would be … Continue reading