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  • Title: Relations between twins' similarity of appearance and behavioral similarity: testing an assumption.
    Author: Matheny AP, Wilson RS, Dolan AB.
    Journal: Behav Genet; 1976 Jul; 6(3):343-51. PubMed ID: 987782.
    Abstract:
    Questionnaires rating twins' physical similarity and similarity of dress were obtained from the parents of 121 identical and 70 same-sex fraternal twin pairs. Within-pair difference scores on several behavioral measures (two intelligence tests, two perceptual tests, one reading test, one test of speech articulation, and one personality inventory) were correlated with the twins' scores for physical similarity and similarity of dress. The correlations revealed no systematic relation between the similarity of appearance and the similarity of behaviors for either the identical twin pairs or the same-sex fraternal twin pairs. The assumption that twins' behaviors are more alike because they are more similar in appearance does not seem warranted.
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