heritability (redirected from narrow sense heritability)

heritability /her·i·ta·bil·i·ty/ (her?i-tah-bil´i-te) the quality of being heritable; a measure of the extent to which a phenotype is influenced by the genotype.

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her·i·ta·bil·i·ty (hr-t-bl-t)

n.

1. The quality of being heritable.

2. The proportion of phenotypic variance attributable to variance in genotypes.

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heritability

1. the proportion of total variation in the population that can be attributed to variation in genetic factors.

2. the degree to which inheritance plays a part in the etiology of a disease.

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broad-sense heritability

the degree to which a trait is genetically determined, expressed as the ratio of the total genetic variance to the phenotypic variance (V_G/V_P).

narrow sense heritability

the degree to which a trait is passed from parent to offspring expressed as the ratio of the additive genetic variance to the total phenotypic variance (V_A/V_P).