Dictionary of Human Evolution and Biology

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Heritability

Proportion of total variance in a certain trait attributable to genetic variation; additive variance. The value of the heritability estimate is a function of genetic factors, environmental factors, and the interaction of genetic with environmental factors. There are several standard methods of measurement:
(1) Holzinger’s H;
(2) broad-sense heritability (H), the proportion of total population variance in a phenotypic character due to individual differences in genotypes; and
(3) narrow-sense heritability (h2), the proportion of total population variance in a phenotypic character due to individual differences in genotypes that will be inherited in offspring. Only narrow-sense heritability is the proportion of the genetic variance that is additive.

Cf. e2.

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