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Ancestry's Beta DNA Roll-out

Replies: 65

Re: Ancestry's Beta DNA Roll-out

Posted: 9 Mar 2012 12:59PM GMT
Classification: Query
This is as good a place as any to discuss the results, although this whole thread should probably be moved to the "General Research" topic instead of "Announcements of DNA Projects." My results still aren't posted.

Ancestry's FAQ on DNA is pathetic. They haven't done a good job explaining Y-DNA or mtDNA, and autosomal DNA testing is even more complex.

We only inherit half of each parents' autosomal DNA, so half the genetic information is "lost" each generation. (If you have siblings, more will have been preserved.) After 5-6 generations, it's entirely possible you didn't inherit any detectable DNA from some ancestors. That's one reason the bio-geographical ancestry (BGA) analysis of your autosomal DNA may not seem intuitively correct.

Another has to do with admixture. If your ancestors all lived in the same, small village for generations, your BGA analysis would be straight-forward (and similar to every other village resident). But in populations with high degrees of admixture (e.g. Americans), it's difficult to distinguish between different ethnic backgrounds. Since we have two copies of each chromosomes--one from each parent--the combination of DNA from each can appear very different than either by themselves.
SubjectAuthorDate Posted
Marcus David ... 8 Mar 2012 2:07PM GMT 
nathan_mn 9 Mar 2012 5:58AM GMT 
bethquave 9 Mar 2012 2:55PM GMT 
nathan_mn 9 Mar 2012 7:59PM GMT 
bethquave 9 Mar 2012 8:25PM GMT 
nathan_mn 10 Mar 2012 5:35AM GMT 
dorisw 10 Mar 2012 12:45PM GMT 
nathan_mn 10 Mar 2012 2:21PM GMT 
BillHarvey34 15 Mar 2012 6:44PM GMT 
JMSaxby 12 Mar 2012 9:17PM GMT 
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