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Problem 5 - Entrance Test
Allopatric speciation is most directly caused by:
A. Reproductive isolation within the same geographic area.
B. Geographic separation preventing gene flow.
C. Polyploidy in flowering plants.
D. Artificial selection in cultivated species.
Check Answer
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Correct: B
Allopatric speciation occurs when populations are physically separated (geographic isolation). Gene flow cessation allows independent evolutionary changes, leading to reproductive isolation.