ABSTRACT
Human behavior, like all phenotypes, has a genetic component, though it is difficult, if not impossible, to match genes to behaviors. Genetic differences among humans may explain part of the range of behavior of people in any group. Variation in behavior between natural human populations has no detectable genetic basis; between groups of people defined in other ways, it is difficult to tell, but people want an easy answer, which comes at a social cost. The search for generalizations about human nature is undermined by human biology, the prevalence of genetic polymorphism. Speculations on human nature have tended to be derived from the false premise that normal behavior can be narrowly delineated. The essence of human nature, however, is to be multifarious.
