| Binet, Alfred, 144
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| Biological determinism, 78. See also Behavioral genetics
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| Birth defect, occurrence of twins as, 11, 86, 96
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| Black Elderly Twin Study, 7
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| Blackmore, Susan, 59
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| Blacks. See Race
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| Boklage, Charles E.
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| and chimeras, 94
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| and mirror imaging, 119
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| study of schizophrenia in identical twins, 120-121
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| study of twins vs . singletons, 97
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| view of vanishing twins, 88-89
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| Bouchard, Thomas J., Jr., 43-57, 58, 61, 62, 63, 141
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