 The assumption made by many evolutionary biologists is that \(V_I, V_{G\times E}\) and \(\COV(G,E)\) are generally small and the most important component of variance from an evolutionary standpoint is \(V_A\). As a result, evolutionary biologists are usually interested in \(h^2 (= \bfrac{V_A}{V_P})\). In contrast, psychologists and behavioral geneticists are more interested in \(h_b^2 (= \bfrac{V_G}{V_P})\). Psychologists are interested in the contribution of genes to human psychological traits whereas evolutionary biologists use heritability measures to predict and measure the response of a trait to selection. The relevant equation here is