In 1964, the Skipper, Gilligan, and their passengers are shipwrecked! Unknown to them, the rest of the world annihilates each other in a nuclear warm and they are the last 17 people on the earth. What evolutionary force would be primarily responsible for the genetic makeup of remaining human 2,000 years later?
A. Natural selection
B. Genetic drift
C. Gene flow
D. Mutation
E. Non-random mating
Ans: B. Genetic drift
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