Mentors Tips - How to wrap your mind around who your X-Chromosone DNA test reveals?

+19 votes
353 views

I have been on another fact finding mission in the realm of DNA - understanding which of my ancestors actually shows-up in my X-Chromosone DNA test results.

I was a bit flummoxed (bewildered/confused) by the fact that I wasn't seeing any of my fathers fathers information. I was also flummoxed that I wasn't seeing any of my mothers fathers fathers information (this line started out with a bizillion kids in the first US generation in the 1700's so where were they all?).

I knew it had something to do with how we inherit our DNA and I knew it had to do with dwindling percentages - I looked at videos and charts and it kind of made sense but it didn't sink it in. I was still flummoxed.

I have been using my DNA Ancestors list to build a list of my surnames on my profile page with links to my MDA (most distant ancestors) so I could direct DNA matches to this list (what a great tool it has turned out to be).

When I printed a hard copy of my DNA Ancestors and started actually trying to figure out who was who in the list, the pieces started coming together for why my two grandfathers lines weren't showing up.

Since my Dad only inherited his X-chromosome from his mother, his father doesn't appear in my X-Chromosome DNA information - since my mothers father only inherited his X-chromosome from his mother, his father doesn't appear in my X-Chromosome information.

It's all very simple really. So applying this all the way down my ancestor list turned a confusing seemingly jumping around at will list, into a list where the males inherit X-chromosome from their mothers only so the list never goes up the male line. This is carried on throughout the list.

Try this for yourself. Pull up your DNA Ancestors list and start filling in your blanks and see if X-Chromosome DNA doesn't become very clear to you.

Mags, The Flummoxed Mentor

Directions to your DNA Ancestors: Tree & Tools Tab or My WikiTree drop-down menus > Tree & Tools > Genealogy Research > DNA Ancestors > X-Chromosome 

in The Tree House by Mags Gaulden G2G6 Pilot (535k points)
retagged by Mags Gaulden
Thanks for the explanation.  It's hard for my little pea brain to follow all this DNA stuff, but your explanation does help make it clearer.
I told you I was Flummoxed didn't I? Thank you and I corrected the post. Mags
This Q&A with feedback is one of great beauties of G2G and WikiTree!

1 Answer

+8 votes
 
Best answer

Hey Mags!  Great post.

Re:  "I have been using my DNA Ancestors list to build a list of my surnames on my profile page with links to my MDA (most distant ancestors) so I could direct DNA matches to this list (what a great tool it has turned out to be)."

This is a great idea.  It would work well with our auDNA/FamilyFinder list of Surnames:  http://www.wikitree.com/treewidget/Gaulden-7/10 

Sysops, can you develop a program to list the Most Distant Ancestors for a person?  They wouldn't need to be in a chart format because some lines are longer than others, but a list of links to the MDAs would be great.  

by Kitty Smith G2G6 Pilot (553k points)
selected by Mags Gaulden
Mags - thanks so much for this explanation - now if I get mine done I wont have to wonder and will know!

Might get my sons first then mine

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