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[–] Commie_Meta 0 points 0 points (+0|-0) ago 

What you are taking about is the founder effect, where a trait can become common if it occurs in a founder of a small population that later grows. An example of this is the increased frequency of Hirschsprung disease in the Old Order Mennonites.

This turns out to not usually be the case with human coloration. For example, there are six different common mutations that cause most red hair in Ireland, and a few less common ones. Most (all?) of them affect the type 1 melanocortin receptor, and the DNA have been sequenced. That implies a large population with a strong reproductive advantage for red hair and freckled pale skin.