In a small group of people living in a remote area, there is a high incidence of blue skin, a condition that results from a variation in the structure of hemoglobin. All of the blue skinned residents can trace their ancestry to one couple, who were among the original settlers of this region. The unusually high frequency of blue skin in the area is an example of
A. mutation
B. genetic drift
C. natural selection
D. sexual selection
E. heterozygote advantage
Ans: B. genetic drift
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