The genetic basis of behavior has become an important aspect of human psychology. As biologists learn more about the ways in which genetic predispositions influence human behavior, psychologists have become more sensitive to those influences as well.
Biological sex also plays a role in human behavior. Some psychologists have developed sex-specific treatments and theories in order to account for the differences between men and women - both behaviorally and developmentally.
The field of sociobiology, founded by American biologist Edward O. Wilson, combines psychological and biological theories in order to explain human behavior in a comprehensive way. The field and its assumptions remain controversial.