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Ancestry DNA Question

Replies: 8

Re: Ancestry DNA Question

Posted: 12 Oct 2013 4:12PM GMT
Classification: Query
Lee, mitotic recombination does occur, but it's "rare and abnormal."

http://sekelsky.bio.unc.edu/Research/Mitotic_rec.html

Thus the pieces are larger than you seem to think. Perhaps it would help to look at some real-life examples of how segments are shared between cousins. K&D and K&J are first cousins once removed, and K&L are second cousins once removed. You can see how the amount of DNA has decreased in the more distant relationships. As more generations pass, the amount decreases, but the size of any remaining segments can be long enough to recognize. This is because of the low probability of a recombination event occurring in the middle of a segment.

It's true you can't identify whether a cousin is on the maternal or paternal side with just a single comparison. But people build up connections by testing multiple cousins, some on the maternal side and some on the paternal side.

http://blog.23andme.com/23andme-and-you/23andme-how-to/track...
SubjectAuthorDate Posted
Lee_Maynus 10 Oct 2013 3:45AM GMT 
DPotts57 10 Oct 2013 9:59AM GMT 
APTurner 10 Oct 2013 1:07PM GMT 
S_H999 11 Oct 2013 5:16PM GMT 
Lee_Maynus 11 Oct 2013 6:45PM GMT 
MJ782 12 Oct 2013 5:34AM GMT 
Lee_Maynus 12 Oct 2013 7:01PM GMT 
Lee_Maynus 12 Oct 2013 8:49PM GMT 
APTurner 12 Oct 2013 10:12PM GMT 
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