Would require a lot of sterilizations, though. Feasible without compulsion?
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The usual way this happens in nature is mortality of unhealthy individuals
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Modern prosperity and medicine have largely eliminated these selective forces, though.
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If we're talking about small primitive tribes, they still have a lot of that
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Many tribal societies dealt with it by practicing exogamy.
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One thing often missed re inbreeding: in animal breeding, it's often used to expose bad alleles to allow selection against them. More exogamy doesn't get rid of the bad stuff as well, just spreads it around more
End of conversation
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