Re: The YEC model requires beneficial mutations and strong positive selection.
If there are seven genes for skin color with two alleles each and you can get sixteen shades from only two, extra alleles are not needed.
Well, evolution and mutation do not operate on what is needed. You should know that after all this time arguing about it.
The extra alleles are there whether they are "needed" or not. Mutations just keep on happening in every generation and occasionally they create new alleles. If they are not lethal or do not damage fecundity they are passed on and accumulate in the population.
This has been documented more and more precisely as our methods of genetic mapping have improved.
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