If I were to go back in time to the 9th century ad, would it be biologically possible to have a child with my distant grandfather? How genetically dissimilar are we?
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Your father shares 50% DNA with you.
Your grandfather, 25%.
Your great grandfather, 12.5%
Your great great grandfather, 6.25%
A first cousin shares 12.5% and a second cousin shares 3.125%.
So, your great, great grandfather falls somewhere between a first and second cousin. That’s not too icky….biologically.
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