Genetic and environmental influences on behavior: Capturing all the interplay.

TLDR

Basic quantitative genetic models show that behavior is shaped by genetics, yet they only estimate average population-level effects, obscuring within-population differences and interactions between specific genes and environments. The article introduces a more advanced quantitative genetic model that explicitly captures gene–environment interactions and correlations. The model demonstrates that gene–environment interactions and correlations are intertwined, enabling integration of quantitative and molecular genetics to elucidate how genetic and social forces shape behavior even without DNA sequence variation.

Abstract

Basic quantitative genetic models of human behavioral variation have made clear that individual differences in behavior cannot be understood without acknowledging the importance of genetic influences. Yet these basic models estimate average, population-level genetic and environmental influences, obscuring differences that might exist within the population and masking systematic transactions between specific genetic and environmental influences. This article discusses a newer, more sophisticated and powerful quantitative genetic model that articulates these transactions. Results from this model highlight the ways in which the gene- environment interaction and correlation are intertwined. They can be used to integrate findings from quantitative and molecular genetic studies and to understand the roles of genetic influences and social forces in manifested behaviors, even when DNA sequence variation is not relevant.