A sterile mule is produced by mating a horse and a donkey.This is an example of ____ reproductive isolation.

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This is an example of postzygotic reproductive isolation, because the hybrid offspring (mule) of a horse and a donkey is sterile and cannot produce viable offspring of its own. This is a type of hybrid inviability or hybrid sterility, which is a type of postzygotic barrier to reproduction.

A Sterile Mule Is Produced by Mating a Horse and a Donkey.This