Re:Rare 'goat-sheep' born on Irish farm
by Houshalter on Saturday April 05, 2014 @01:07PM
(#7537628)
No it's much closer to 1,000 years. Every generation the number of possible ancestors you have doubles. 2 parents, 4 grandparents, 8 great grandparents. Within a few generations back, you have literally millions of ancestors.
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Doesn't that assume no overlap? It seems like the odds of 2^n unique ancestors would be pretty low by the time you get to 10.
Re:Rare 'goat-sheep' born on Irish farm
by maxerickson on Saturday April 05, 2014 @04:35PM
(#7538347)
This seems like a reasonable discussion of the issue:
http://gcbias.org/2013/11/11/how-does-your-number-of-genetic...
After ~15 generations your genealogical ancestors aren't all that likely to have contributed much to your DNA.