Genetic and Environmental Influences in Adolescent Peer Socialization: Evidence from Two Genetically Sensitive Designs.

Examined genetic and environmental contribution to self-reported peer-group characteristics among adoptive and nonadoptive adolescent sibling pairs. Found that although peer preference is influenced, in large part, by nonshared environment factors, genetic influence is present. Substantial genetic influence emerged for college orientation, and genetics were implicated for peer popularity for twins but not for non-twin siblings. (JPB)