| Black Elderly Twin Study, 7
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| cultural disadvantages vs . genetic differences, 134-138
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| and heritability of intelligence, 13, 14, 28-30
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| and IQ scores, 28-29, 133-138
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| Registries of twins, 7, 146
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| Religion, and twins raised apart, 57-58, 146
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| Reuniting of identical twins, 37-39, 76
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| Roeder, Katherine, 74
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| Rose, Richard, 118
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| Rose, Steven, 71, 78
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| Scarr, Sandra, 62-63, 133-138, 141-142, 151-152
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| Schizophrenia, 120-121
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| Segal, Nancy, 111, 120
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|