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Ancestry's Beta DNA Roll-out

Replies: 65

Re: Ancestry's Beta DNA Roll-out

Posted: 1331323178000
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 ... 1331215666000 
nathan_mn 1331272712000 
bethquave 1331304926000 
nathan_mn 1331323178000 
bethquave 1331324743000 
nathan_mn 1331357733000 
dorisw 1331383525000 
nathan_mn 1331389298000 
BillHarvey34 1331837097000 
JMSaxby 1331587069000 
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