Personality resemblance in adoptive families: A 10-year follow-up.

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Key Points

Investigate the influence of genetics and environment on personality traits in adopted children over a 10-year period.
Recontacted 181 families from the Texas Adoption Project after 10 years, averaging age 17.
Administered MMPI, 16PF personality tests, and life events questionnaire; parents rated children on 24 bipolar traits.
Analyzed parent-child and sibling correlations to assess genetic and environmental contributions.
Estimated genetic influence on personality traits at approximately 0.25 heritability.
Observed a shift in emotional and social adjustment favoring biological children over adopted ones.
Found significant contributions from idiosyncratic environments with near-zero influence from shared family environment.

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Longitudinal study examines personality traits in adoptive families, indicating genetic influences on children.

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Loehlin et al. (1987) studied this question.

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