So, Yeah, jury is still out on it but most probably this isn't a case of adaptability but of relaxation of it. Once we migrated to less suny climates, mutations on iris color genes were tolerated better, thus propagating. It's still used as example for
I suspect there was a lot of sexual selection for eye color in high latitudes, but I don't know enough about the physiology of irises and vision to judge if there may have been other benefits.
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Is it true that humans having chins is pure sexual selection? I read something a couple of years ago that suggested there was no evolutionary benefit to having a chin. Lol random but interesting.
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Hmm, I thought it was a mutation?
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Every selected trait starts out based on mutations....
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