Heritability

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English: Heritability Czech: Heritabilita, dědivost

Heritability denotes the fraction of trait variance due to genetic factors (V_G) over the total trait variance (V_P). This broad-sense heritability H² is thus calculated as follows:

$H^{2}={\frac {\color {Red}V_{G}}{V_{P}}}$

H² can theoretically reach values between 0 and 1; if H² = 0, the trait/phenotype variance is fully dependent on environmental factors, on the contrary, if H² = 1 the environmental factors play no role and the trait variation is determined only genetically.

Often we need to know just the share of additive genetic component (V_A) responsible for trait variance, i.e. the narrow-sense heritability, dubbed h² and calculated as follows

$h^{2}={\frac {\color {Red}V_{A}}{V_{P}}}$

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Multifactorial Inheritance, Heritability