Heritability is the statistical metric that estimates the relative influence of genetic variation (measured as genetic variance) on phenotypic variation (phenotypic variance), relative to the influence of environmental differences (environmental variance).
Heritability is a statistical parameter that is often used in discussions of genetic causation and the nature versus nurture debate. The heritability of a trait, represented by either H2 (for broad heritability) or h2 (for narrow heritability) is between 0 and 1. Traits with a high heritability are generally seen as genetically influenced, and those with a low heritability as environmentally caused (Lynch and Bourrat 2017).
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