Introduction to Quantitative Genetics
Heritability
The general term that describes the proportion of the genetic variance to
the total variance is heritability.
Boadsense heritability is the ratio of total genetic variance to
total phenotypic variance.

H^{2} =
V_{G}/V_{P}
Narowsense heritability is the ratio of additive genetic variance
to the total phenotypic variance.

h^{2} =
V_{A}/V_{P}
Important points about heritability

The heritability estimate is specific to the population and environment you
are analyzing.

The estimate is a population, not an individual parameter.

Heritability does not indicate the degree to which a trait is genetic, it
measures the proportion of the phenotypic variance that is the result of
genetic factors.