It might make them less numerous compared to hyaenas. It doesn't benefit lion genes in general. But this gene will be selected for.
I might say that it takes two people of the new group to equal the same genetic interest you had in one person of your ethnic group
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(but we're also assuming that we're simply spreading the copies more thinly among more people)
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The point is that a race can disappear without reducing the fitness of its individuals or genes.
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Your idea of "genetic interest" is not an implication of evolutionary theory, because you didn't evolve to act in your "genetic interest".
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You evolved to reproduce, not to act for the good of your genes (whatever that means). Reproduction is the basis of selection.
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If you think about the genes you share with others, you share most of your genome with all vertebrates.
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I think you share about 25% of your genes with a sea cucumber. Would you kill your child to save 5 sea cucumbers? No.
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Suppose you had children with a Chinese woman, so that you shared more genes with a random white person than your own child.
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Do you think you would kill your child to save a random white person? No, of course not. Because you were selected to reproduce.
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