Given natural selection is true, why do we still have genetic eye sight issues? Because I would think bad eye sight would get you killed (or at least the inability to eat) in a hunter gatherer society.
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In general, age-related diseases (which are fundamentally genetic in origin, but obviously not the only kind of genetic disease) are not important if they appear after you successfully reproduce. Also, if the typical individuals life span is less than when age-related issues appear, then you don’t have a problem at all (and so no evolutionary pressure) until/unless for some reason life span extends rapidly.
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