Abstract
Sibling correlations in body size and composition are considered in 114 pairs of American Black and 101 pairs of White sibs, ranging in age from 6 to 12 years. Correlations were similar in the two races. Sibling resemblance was more or less similar for skeletal measurements (0.35-0.48), limb circumferences (0.41-0.43), and skinfolds (0.31-0.41). Age difference between members of a pair was found to affect the sibling correlations, especially for measurements of low genetic control. This is taken as evidence for environmental contributions to sibling resemblance. Higher sister-sister similarities in fat (as compared to brother-brother) were evident in Blacks (as they were in a rural South American sample) but not in Whites. This pattern could arise from similar sex-role differentiation in these two cultures (Afro and Latin American) or similar expression of sex-limited genes under less favourable environmental conditions.
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