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Ancestry DNA Question

Replies: 8

Re: Ancestry DNA Question

Posted: 1381615927000
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 1381376743000 
DPotts57 1381399178000 
APTurner 1381410475000 
S_H999 1381511794000 
Lee_Maynus 1381517113000 
MJ782 1381556088000 
Lee_Maynus 1381604465000 
Lee_Maynus 1381610956000 
APTurner 1381615927000 
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