Just as they promised, and right on schedule, Family Tree DNA today announced X chromosome matching. They have fully integrated X matching into their autosomal Family Finder product matching. This will be rolling live today. Happy New Year from Family Tree DNA!!!
In the article, X Marks the Spot, I showed the unique inheritance properties of the X chromosome. In a nutshell, men only inherit one copy from their mother, because they inherit a Y from their father, but women get a copy from both parents. Still, you don’t inherit parts of your X from all of your ancestors, so knowing your own X inheritance pattern can help immensely to rule out common genealogy lines when you match someone on the X.
In their informational rollout, Family Tree DNA provided the following information about their new features.
Here is the menu link to the Family Finder Matches menu.
On the Family Finder Matches page, there is a filter to show only X-Matches.
When you use the X-Match filter on a male Family Finder kit, you should get only matches from the maternal X-Chromosome.
Next, like other Family Finder Matches you can expand the advanced bar for a match and click to add the match to the Compare in Chromosome Browser list.
Matches are added to the Compare in Chromosome Browser list. You could go right to the Chromosome Browser by clicking on the compare arrow at this point.
Next we can also go right to the Chromosome Browser.
The Chromosome Browser also lets you filter the match list by X-Matches.
Here are three immediate relatives. The first two share X-Chromosome DNA. The third (green) one does not.
When we scroll down to the X at the bottom, we see that X-Matching is displayed for the first two but not the third.
Moving to the Advance Matching page, X-Chromosome matches have also been integrated.
X-Match is an option that can be checked alongside other types of testing.