Crosses between the flour beetles Tribolium castaneum and T.freemani result in large numbers of hybrids that survive, but are sterile.This is an example of

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The fact that the hybrids between Tribolium castaneum and T. freemani are sterile indicates that there is a postzygotic reproductive isolation mechanism in place. This means that although fertilization and development of the hybrid zygote is successful, the resulting adult is unable to produce viable gametes, therefore no further offspring can be produced.

Crosses Between the Flour Beetles Tribolium Castaneum and T