One mechanism that has been suggested for this is gene–environment correlation (rGE). rGE occurs when the same genes affect both a trait and relevant features of the environment, and also acts to increase the amount of variance ascribed to genetic factors (Kendler & Baker, 2007; Scarr & McCartney, 1983). rGE can be divided into three types. The passive form of rGE occurs when parents provide both genes and early environmental conditions for their children. The active form concerns the tendency for individuals to seek environments that reinforce genetic predispositions The third type, evocative/reactive rGE, refers to the way in which genetically driven behaviors can result in the creation of specific environmental responses (Plomin, DeFries, & Loehlin, 1977). The relative prominence of these factors is likely to change over development, and may increase as children become more independent and able to choose their own environments.
