Broad Sense Vs Narrow Sense Heritability
H 2 is the broad sense heritability. This reflects all the genetic contributions to a population s phenotypic variance including additive dominant and epistatic multi genic interactions as well as maternal and paternal effects where individuals are directly affected by their parents phenotype such as with milk production in mammals.
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In practice the flexibility of broad sense h 2 makes it very hard to estimate without making strong assumptions.
Broad sense vs narrow sense heritability. H 2 v a v d v i v a v d v i v e breeding values are the expected phenotypic value of an individual s offspring measured as the deviation of an individual s offspring from the population. H 2 s g 2 s p 2 therefore h 2 simply gives a measure of the proportion of phenotypic variance which is due to genotype. Broad sense heritability and narrow sense heritability.
I mentioned last time that heritability v g v p where v g is the genetic variance among individuals and v p is the total phenotypic difference among individuals. H 2 v g v p. The broad sense heritability is the ratio of total genetic variance to total phenotypic variance.
The narrow sense heritability is the ratio of additive genetic variance to the total phenotypic variance. There are two different types of heritability. The proportion of phenotypic variance due to additive genetic variation termed narrow sense heritability h 2 is perhaps the most fundamental aspect of a trait s genetic architecture and has.
H 2 v a v p. Heritability in broad sense and narrow sense heritability in broad sense h 2 is calculated using the following formula. Consequently broad sense heritability is a coarser upper bound estimate of heritability that is confounded with dominance variance.
However this does not tell us what proportion of an individual s phenotype is due to genotype. Broad sense heritability a k a h is the degree in which phenotypic variation is due to genetic factors narrow sense heritability a k a h is the degree in which phenotypic variation is due to. Important points about heritability the heritability estimate is specific to the population and environment.
Furthermore v p v g v e where v e is the environmental variance contributing to phenotypic differences. Allowing for effects of all possible interactions of all possible genetic variants means having a functionally infinite space of possible effects.
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