A male from species A mates with a female from species B.Male A's sperm swims and finds the egg,but the sperm is unable to penetrate the egg.This is an example of

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This is an example of gametic isolation, where the gametes of different species are incompatible, preventing fertilization from occurring. In this case, the sperm of species A is unable to penetrate the egg of species B, indicating a lack of compatibility between their gametes.

A Male from Species a Mates with a Female from Species