Tag: X-DNA

New GEDmatch X-chromosome comparison links at WikiTree

From WikiTreer-in-Chief, Chris Whitten comes this great announcement about new GEDmatch X-chromosome comparison links at WikiTree.

“Hi WikiTreers,

We just took another small step forward in our collaboration with GEDmatch.com.

As most of you know, you can click directly to view one-to-one autosomal test comparisons on GEDmatch from WikiTree profile pages and DNA Ancestor Confirmation Aid pages. You can also do Y chromosome and mitochondrial DNA comparisons through Ysearch and MitoSearch “[compare]” links on WikiTree.

One thing we haven’t had until now is easy X-chromosome comparison links. X comparisons can be especially powerful for genealogy because there is a more limited inheritance pattern on the X than the autosome and almost everyone who has taken an autosomal DNA test (all 10 or 12 million of us!) has X chromosome test results too. There is a lot of untapped potential for DNA confirmation using X matches.

Here’s an example of how you might use this. Look on your DNA Ancestors page — this is the “DNA” link on the pull-down menu that starts with your WikiTree ID — and scroll to the X Chromosome section. These are the ancestors from whom you inherited your X DNA. Choose one of the distant ones and click the DNA Descendants icon  next to their name.

On your ancestor’s DNA Descendants page scroll to the X Chromosome section. These are the descendants — yourself and your cousins — who are likely to match each other on the X. If more than one of you are on GEDmatch you can click the “[compare]” links to see whether you match as you would expect.

Here are a couple examples of DNA Descendants pages where you can see the new GEDmatch comparison links:

Maybe a more informed genetic genealogist will follow up here with advice on doing the actual DNA confirmations, or with other ideas for using this new feature.

Onward and upward,

Chris

P.S. A big thank you to John Olson, Curtis Rogers, and our other friends at GEDmatch for enabling us to create these links. Thank you to Blaine Bettinger for his early and ongoing evangelism for X chromosome usage. (We used Blaine’s charts to create our XDNA ancestor and descendant pages.) And thank you to Mags Gaulden, Kay Wilson and the other DNA Project members for their leadership on these subjects, most especially — especially — thank you to Peter Roberts, who suggested this feature and helped it all come together, as he has with many of our DNA features.”

This is just great Chris (and Peter),

X-DNA is often overlooked, but can be a powerful tool because it’s inheritance is very specific. Click on your DNA link as Chris suggested and look at how this sex chromosome is inherited.

For a female:

  • From your Dad and his Mother.
  • From your Mother and her parents

For a Male:

  • From your Mother and her parents

It’s so specific. The Confirmation Citation is really informative too:

* Maternal relationship is confirmed by a 108.0 cM X chromosome match between John Kingman GEDmatch T782948 and his second cousin once removed Kelly Miller GEDmatch A721343. Their MCRA is Charles Cyrus Babst.

Take some time to look at some of those X-Matches WikiTree has posted for you. You might get a pleasant surprise.

My Dad and I from this new feature:

Chr Start Location End Location Centimorgans (cM) SNPs
X 2,710,157 154,551,755 190.1 16,903

Chr 23

Mags