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That is because the Y had to have come from the father.

This is how a maternal uncle and nephew might share some of their X chromosome.

Now let’s see what happens with a paternal uncle and nephew: Here we have the same sort of layout.

This normally wouldn’t happen with a nephew and uncle on the father’s side.

This is just one way that close relations might make it so the paternal uncle and nephew share DNA on their X chromosome.

This is because the X chromosome (or any other chromosome) from your common ancestor has probably been chopped and swapped along the jumps from one generation to the next.

Last modified 23-Dec-2020 17:25