Gene-environment correlation may also have implications for personality development. Passive gene-environment correlation leads to increased sibling similarity, regardless of genetic similarity between siblings. In other words, the effects of passive gene-environment correlation contribute to the estimate of shared environmental influence when not explicitly modeled (Purcell, 2002). Active and evocative gene-environment correlations result in nonrandom environmental experiences, such that environmental effects become tied to genotypic differences. In other words, the effects of active and evocative gene-environment correlation contribute to the estimate of genetic influence when not explicitly modeled (Purcell, 2002).
