Heritability
From WikiLectures
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 H^{2} is thus calculated as follows:
H^{2} can theoretically reach values between 0 and 1; if H^{2} = 0, the trait/phenotype variance is fully dependent on environmental factors, on the contrary, if H^{2} = 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 h^{2} and calculated as follows