| corroboration of findings, 63
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| study of twins, 12-14, 15, 144
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| "Gay gene," 81-82. See also Homosexuality
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| Gedda, Luigi, 120
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| Gender. See also Homosexuality; Transsexuals
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| and identical twins, 113-117
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| John/Joan case, 114-117
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| Genes. See also Heritability; Behavioral genetics
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| vs . behavior, 22, 83
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| and free will issue, 154-157
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| and intelligence, 72-75, 79, 144-145
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| and race, 28-30, 134-138
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| role in personality development, 147
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|