If you observed that the sperm of a bull could not fuse in a lab dish with the eggs of a cow, you would say that the bull and the cow showed gametic isolation.
A type of isolation that occurs in many aquatic animals of different species. These species deposit gametes in the water, in the same place and at the same time, with fertilization occurring only between gametes originated by the same species.
Reproductive isolation mechanisms that operate prior to mating are called prezygotic reproductive barriers. These barriers are important, as they prevent individuals of different species from interbreeding and reproducing.
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