Aggressive behavior in middle childhood is at least partly explained by genetic factors. Nevertheless, estimations of simple effects ignore possible geneenvironment interactions (G x E) or geneenvironment correlations (rGE) in the etiology of aggression. The present study aimed to simultaneously test for G x E and rGE processes between aggression, on the one hand, and peer victimization and the teacherchild relationship in school, on the other hand. The sample comprised 124 MZ pairs and 93 DZ pairs assessed in Grade 1 (mean age = 84.7 months). Consistent with rGE, children with a presumed genetic disposition for aggression were at an increased risk of peer victimization, whereas in line with G x E, a positive relationship with the teacher mitigated the genetically mediated expression of aggression.
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