AP Biologyeasymcq1 pt
The bottleneck effect is a form of genetic drift caused by
A.a sudden drastic reduction in population size
B.migration between populations
C.sexual selection only
D.gradual environmental change
Explanation
Core Concept
A catastrophe leaves few survivors whose alleles — by luck, not fitness — become the new population's gene pool, slashing diversity.
Correct Answer
Aa sudden drastic reduction in population size
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