Yeah, that usually happens, until they mix. People naturally divide into groups, and race can be the basis for that.
Hang on, if selection is on the DNA/gene level and if we may say that we have a genetic interest in our children, then
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how can we not have a genetic interest in our ethnic group?
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First of all, "genetic interest" is a misleading term. You are selected to be a DNA replicator, and to be good at that function.
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Selection at the gene level does not imply that the phenotype does what is "good for the genes" necessarily.
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Eg suppose there is a gene that makes male lions kill offspring of other males. This behavior might not be good for lions in general.
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It might make them less numerous compared to hyaenas. It doesn't benefit lion genes in general. But this gene will be selected for.
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That particular gene may be selected for internally among lions even as it reduces lion numbers, sure. We might call this
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different bits of DNA competing against each other within a single organism.
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That's a misleading way to think about it. Remember that "genes competing" is a metaphor.
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