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Reise, Marilyn L. – Child Development, 1990
Findings indicated that zygosity was not related to behavioral scores during the neonatal period, and that environment substantially influenced neonatal temperament. Specific perinatal indicators of risk were found to account for some of the intrapair differences in behavioral variables. (RH)
Descriptors: At Risk Persons, Comparative Analysis, Environment, Heredity

Hur, Yoon-Mi; Bouchard, Thomas J., Jr. – Child Development, 1995
Estimates the extent to which heredity influences perceptions of childhood family environment in a sample of 58 monozygotic and 46 dizygotic pairs of adult twins who were reared apart. The data confirm the importance of genetic factors in some, but not all, measures of family environment. Environmental influences were more important than genetic…
Descriptors: Adults, Child Rearing, Comparative Analysis, Family Environment