offspring is that the harmful mutant genes are virtually always recessive, so that genetic differences between parents cause most if not all of the harmful genetic traits to be matched in the pair with a non-harmful partner. That is why it is genetically dangerous for closely related people to have offspring together, and why racial hybridization produces, on average, hardier offspring.
Downvote me if you will, for the crime of approving of interracial relationships.
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