Two species that sometimes mate and produce vigorous but sterile offspring are separated by

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When two species mate and produce offspring that are vigorous but sterile, it is a result of reduced hybrid fertility. This means that while the hybrid offspring may be able to survive and develop normally, they are unable to produce viable offspring of their own. Gametic isolation refers to the inability of sperm from one species to fertilize the eggs of another species. Hybrid breakdown occurs when first-generation hybrids are fertile but their offspring (second-generation hybrids) are feeble or sterile. Reduced hybrid viability refers to the reduced survival of hybrid offspring compared to the offspring of either parent species.

Two Species That Sometimes Mate and Produce Vigorous but Sterile