Genetic correlation
In multivariate quantitative genetics, a genetic correlation (denoted r g {\displaystyle r_{g}} or r a {\displaystyle r_{a}} ) is the proportion of variance that two traits share due to genetic causes, the correlation between the genetic influences on a trait and the genetic influences on a different trait estimating the degree of pleiotropy or causal overlap. A genetic correlation of 0 implies that the genetic effects on one trait are independent of the other, while a correlation of 1 implies that all of the genetic influences on the two traits are identical.