A small population of 500 turtles on an island suddenly suffers a natural disaster leaving only 20 surviving turtles. Before the disaster, the turtles had shells with very different shell patterns. After the disaster, the shells all look very similar. What mechanism can best explain this reduction genetic variation?
(A) Genetic drift
(B) Adaptive radiation
(C) Gene flow
(D) Sexual selection
Answers: 2
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