Which of these is a **post-zygotic** reproductive isolating mechanism?
AHabitat (ecological) isolation
BSeasonal (temporal) isolation
CHybrid sterility (e.g. mule — interspecies hybrid that cannot reproduce)
DMechanical isolation (genital incompatibility)
Answer & Solution
Correct answer: C. Hybrid sterility (e.g. mule — interspecies hybrid that cannot reproduce)
Post-zygotic barriers operate AFTER fertilisation: hybrid inviability, hybrid sterility (mule = horse × donkey, can't reproduce), hybrid breakdown. The other three options are pre-zygotic (prevent mating or fertilisation in the first place).
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