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Term (also heterose = inequality, heteros = the other) for the pronounced performance of hybrids (Mixed breeds) in plant breeding and animal breeding. If the observed performance of the first branch generation (F1 = immediate descendants of the parent generation) is higher than the average performance of this property for the parent generation (parent generation), then one speaks of a (positive to understand) heterosis effect. By genetically different possible purebred breeding lines of the parental generation in one crossing achieves that many alleles (characteristic variants) are different.

strongly heterozygous (Mixed-breed) living beings have more different genes than pure-bred ones. They are often resistant against diseases and can better adapt to changing environmental conditions. The vine is also heterozygous, so a cross between different varieties is usually an advantage. On the other hand, kick at one selfing (Self-fertilization) negative inbreeding effects. In this context it should be noted that strictly speaking, crosses between varieties of the same species (such as Vitis vinifera) are also considered hybrids are to be considered. In general, these are not considered or designated as such. See also under heterozygosity and blossom,

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