--The vast majority of differences would probably be due to genetic drift, not selection. Which is as I said. However genetic drift applies to neutral mutations which by definition don’t affect the phenotype, hence they are not significant for explaining differences between humans and chimps.
I have seen you make this statement several times about neutral mutations. This is incorrect.
Neutral mutations are neutral with respect to fitness, they are not selected out of the population.
They may indeed affect the phenotype without being selected for or against. At some future time the changes to the phenotype may be affected by natural selection.
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