E.O. Wilson in Consilience: The Unity of Knowledge

We know that virtually all of human behavior is transmitted by culture.  We also know that biology has an important effect on the origin of culture and its transmission.  The question remaining is how biology and culture interact, and in particular how they interact across all societies to create the commonalities of human nature.  What, in final analysis, joins the deep, mostly genetic history of the species as a whole to the more recent cultural histories of its far-flung societies?