Postmating reproductive isolation acts after mating. Specify whether the test concerns fertilization, offspring survival, or the offspring's own reproduction; those outcomes are not interchangeable.
Reduced survival or fertility appearing in later-generation or backcross descendants of hybrids, even when first-generation offspring are fertile. genetic recombination can expose harmful combinations previously masked in the first generation.
A barrier to gene flow acting after fertilization, through reduced survival or fertility of hybrids. Test both sexes and later generations: survival of first-generation offspring does not establish their fertility.
Reduced or absent fertility of hybrid offspring. It must be distinguished from failure to mate or reduced viability before reproductive maturity.
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