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Can not simply the regressive gene spread through the descendants until it is spread wide enough for distant relatives that carry the same gene to meat and get kids that turn out blue-eyed?

For a high frequency of distant relatives carrying the same gene, spreading wide is not enough, an increase in frequency is needed, too. (If the frequency doesn't increase, then on average one person will carry the mutated recessive gene in every generation.) That is: the mutated gene variant should reproduce at a higher rate than the non-mutated one. In small populations, this can happen by pure accident (one form of genetic drift). Some form of selection (for blue eyes: probably sexual selection) can increase frequency, too, but for that, you need the trait expressed, so you need to increase the frequency first by some other means.

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Thu Nov 8th, 2012 at 07:40:48 PM EST
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