An interesting
simulation by Luke Jostins:
The probability of having DNA from all of your genealogical ancestors at a particular generation becomes vanishingly small very rapidly; there is a 99.6% chance that you will have DNA from all of your 16 great-great grandparents, only a 54% of sharing DNA with all 32 of your G-G-G grandparents, and a 0.01% chance for your 64 G-G-G-G grandparents.
You only have to go back 5 generations for genealogical relatives to start dropping off your DNA tree. [. . .]
The number of genetic ancestors starts off growing exponentially, but eventually flattens out to around 125 (
at 10 generations, 120 of your 1024 genealogical ancestors are genetic ancestors).
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