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Heterosexism is a system of attitudes, bias, and discrimination in favor of opposite-sex sexuality and relationships. It can include the presumption that other people are heterosexual or that opposite-sex attractions and relationships are the only norm and therefore superior.
Heterosis. (hybrid vigor), accelerated growth and increased dimensions, endurance, and fertility of various first-generation animal and plant hybrids. Heterosis is usually attenuated in the second and later generations.True heterosis, which is the ability of hybrids to leave a large number of fertile descendants, is distinguished from gigantism, which is the enlargement of the entire hybrid organism or of its individual parts.he application of heterosis has been one of the most important contributions of genetics to scientific agriculture in providing hybrid corn, and vigorous, high-yielding hybrids in other plants and in livestock. See Breeding (animal) , Breeding (plant) See Genetics, Mendelism.