Guns, Gangs, and Genes: Evidence of an Underlying Genetic Influence on Gang Involvement and Carrying a Handgun
Gangs and guns represent two key sources of violence in America and around the world. While a considerable amount of research has been devoted to studying each outcome, neither has been extensively studied from a biosocial perspective. The current study addressed this gap in the literature by estimating the genetic and environmental underpinnings to gang membership, carrying a handgun, and the covariance between the two. Analyses of kinship pairs from the NLSY97 data revealed significant genetic influences on all of them. Specifically, genetic factors explained 77% of the variance in gang membership, 27% of the variance in carrying a handgun, and 66% of the covariance between gang membership and carrying a handgun. Just as important, however, is that the shared environment explained none of the variance/covariance across models, with all of the remaining variance being accounted for by nonshared environmental effects (plus error).