Heritability is the proportion of observable differences in a group that can be explained by differences in the genes of the group's members.
Heritability is a measure of how well differences in people's genes account for differences in their traits. Traits can include characteristics such as height, eye color, and intelligence, as well as disorders like schizophrenia and autism spectrum disorder.
Heritability can be between 0 (genetics explains nothing about the trait) and 1 (genetics explains everything). For example, the heritability of height is about 0.80, and the heritability of hours of sleep per night is 0.15-0.20.
Heritability is the single most important consideration in determining appropriate animal evaluation methods, selection methods and mating systems. Heritability measures the relative importance of hereditary and environmental influences on the development of a specific quantitative trait.
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