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Recent behavioral genetic research has demonstrated that genetic influence on individual differences in behavioral development is usually significant and often substantial and, paradoxically, also supports the important role of the environment. This article reviews research on the heritability of intellectual factors, personality factors, and psychopathology. It discusses the importance of investigating within-family environmental differences in order to understand the environmental origins of individual differences in development.
Robert Plomin (Sun,) studied this question.
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