The five laws of behavioral genetics are: All human behavioral traits are heritable The effect of being raised in the same family is smaller than the effect of the genes. A substantial portion of the variation in complex human behavioral traits is not accounted for by the effects of genes or families. A typical human behavioral trait is associated with very many genetic variants, each of which accounts for a very small percentage of the behavioral variability. All phenotypic relationships are to some degree genetically mediated or confounded.