Polydactyly (Having More Than Five Fingers on a Hand) Is

Multiple Choice

Polydactyly (having more than five fingers on a hand) is much more common in some isolated human populations than it is elsewhere.This is most likely an example of a(n) _______, which is due to the evolutionary mechanism called _______.

A) founder effect; gene flow
B) founder effect; genetic drift
C) adaptation; gene flow
D) genetic ratchet; gene flow
E) genetic ratchet; genetic drift