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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How do you know that you are not the eventual product of making a baby with your 9th century ancestor? 😉
Seriously, the amount of DNA you would share with that person would be miniscule, so as long as you were both fertile at the time, you could have a baby with no additional risks beyond that of being in the 9th century.
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