[Doctor Stochastic]

Your post is incorrect because (inter alia) you are assuming that those with a mutation will only interbreed with those without a mutation.

Reading elementary population genetics text may help you avoid these mistakes in the future.

[Gumlegs]

To G3K: ... may help you avoid these mistakes in the future.

ROTFLMAO!

[gore3000]

Your post is incorrect because (inter alia) you are assuming that those with a mutation will only interbreed with those without a mutation.

That has already been discussed. If there is close interbreeding other mutations will destroy the individuals interbreeding with close relatives. This is a very well established fact in genetics and explained in several posts already.