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However, the opposite is also true. Cultures create environments that in turn may select for genes that succeed in the cultural environment. One of the best worked out cases is adult [[lactose]] absorption. In populations with a long history of [[dairying]], such as Northern [[Europeans]] and [[African]] cattle-keeping societies, most adults retain the ability to break down and hence digest the milk sugar lactose. Societies with no history of dairying, such as [[East Asians]] and [[Amerindians]], retain the primitive [[mammalian]] [[genotype]] in which the body shuts down lactose production shortly after the normal age of [[weaning]].
According to some cultural evolutionists our [[social psychology]] was extensively remodeled by a long period of life in [[tribal]] scale social systems whose culturally transmitted rules encouraged much cooperation with non-relatives due to [[group selection]] on cultural variation. [[Charles Darwin|Darwin]] first proposed hypothesis much like this in ''[[
==Research==
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