AP Biologyeasymcq1 pt
A horse and donkey produce an infertile mule. This is
A.hybrid sterility — a postzygotic barrier
B.a prezygotic barrier
C.successful speciation
D.geographic isolation
Explanation
Core Concept
The zygote forms but the adult cannot pass genes on, so the two species stay separate — reduced hybrid fitness after fertilization.
Correct Answer
Ahybrid sterility — a postzygotic barrier
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