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

strongly heterozygous (mixed-breed) living beings have more different heredity than purebred ones. They are often resistant against diseases and can better adapt to changing environmental conditions. Also, the vine is heterozygous, so crossing between different varieties is usually beneficial. On the other hand occur at one selfing (Self-fertilization) negative inbreeding effects. In this context, it must be pointed out that, strictly speaking, crosses between varieties of the same species (such as Vitis vinifera) are also considered hybrids to be considered. In general parlance, these are not considered or designated as such. See also below heterozygosity and blossom,

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