An important consequence of the unique interaction between internal and external forces … is that knowledge of genetic differences contains no information at all about whether a characteristic can be changed by environmental and social arrangements. The most elementary error about genetics and development is to suppose that genetic is the opposite of changeable and that an answer to the question how much can a trait be changed by social, historical, and individual circumstances is given by an answer to the question how important are genes.

Genes and Sexuality: An Exchange (1995)