Provides an overview of recent behavior-genetic studies of personality that document (1) the demonstration of genetic bases for stability of certain personality dimensions, (2) evidence suggesting the most influential environmental sources of variation are those not jointly experienced by family members, and (3) continuing controversy regarding…

Used a longitudinal sibling research design and a large, nationally representative sample of 15- to 22-year-old siblings to study shared and unshared environmental influences on delinquency. Although no unshared family environmental influences were found for sisters and mixed-sex siblings, they may have existed for brothers. Data suggested…

The concept of reproductive strategy is applied to the study of childhood experience and interpersonal development to develop an evolutionary theory of socialization. The relationship between this theory and prevailing theories of socialization is considered, and research consistent with the evolutionary theory is reviewed. Discusses directions…