| Cystic fibrosis, 95, 96. See also Birth defect, occurrence of twins as
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| Daniels, Michael, 74
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| Depression, in female twins, 140, 141
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| Derom, Catherine, 98
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| Determinism, 78. See also Behavioral genetics
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| Devlin, Bernie, 73, 74, 75
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| Diamond, Milton, 116, 117
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| Divorce
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| environmental factors, 150, 151-152
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| heritability of, 150-151, 152
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| and identical twins, 150-151, 154
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| Dizygotic (DZ) twins. See Fraternal twins
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| Dopamine, 80
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|