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Matheny, Adam P., Jr.; Dolan, Anne Brown – Journal of Research in Personality, 1980
In a study of 105 twin pairs, correlations for identical pairs were significantly higher than fraternal pairs on all but one factor: tough-mindedness. Data suggested several components and the total organization of those components of personality and temperament are genetically influenced. (Author)
Descriptors: Child Development, Children, Genetics, Nature Nurture Controversy