Comment: How does the whole DNA from 3

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How does the whole DNA from 3

How does the whole DNA from 3 parents thing work? Like they don't have more genes than a normal child, but do some of the father's genes get replaced by the female genes, or do the two mothers' genes get mixed around in one half? I'm guessing that's the case since the second mother's DNA is just inserted into the egg. Anyways, I'm just wondering what kinds of unforeseen consequences this might have.