replicated findings

Finding 7. Most measures of the “environment” show significant genetic influence

How can measures of the environment show genetic influence? The reason appears to be that such measures do not assess the environment independent of the person. As noted earlier, humans select, modify, and create environments correlated with their genetic behavioral propensities such as personality and psychopathology.

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Finding 9. Most environmental effects are not shared by children growing up in the same family

It is reasonable to think that growing up in the same family makes brothers and sisters similar psychologically, which is what developmental theorists from Freud onwards have assumed. However, for most behavioral dimensions and disorders, it is genetics that accounts for similarity among siblings.

- Top 10 Replicated Findings From Behavioral Genetics by Plomin et al.

see also Commentary: Why are children in the same family so different? Non-shared environment three decades later