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Speciation may occur when different populations of the same species become reproductively isolated. This isolation may prevent the formation of a zygote (pre-zygotic) or may affect the viability of fertility of offspring (post-zygotic).

Which of the following exemplifies a post-zygotic isolation mechanism?

A

Allopatric speciation.

B

Gamete incompatibility.

C

Hybrid sterility.

D

Polyploidy.

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