The realization of any particular trait is at all times & moments a dialectic relationship between the inherited genetic structure of a given organism, and the environment into which it has been placed. Generally, any real discussion of the relationship these things share & how to best account for them is both impossible to have because of, and is also inextricably tied to, specific goals of political economy & of the matter of class rule.

(Incidentally it occurs to me that I should be specific; I mean that it's often impossible to have a serious discussion about questions regarding gene-environment interactions & to discuss, more than simple inheritance, how specific traits actually come to be realized. And I think it's impossible to really get down to the bottom of that question, because the capitalist class & their courtiers in the popular discourse of science are at all times more concerned with justifying their social positions more than answering questions about the actual functioning of biological mechanisms.)