| Inherited tendencies. See Heritability
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| Intelligence. See also IQ scores
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| Burt studies, 27-28
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| environmental factors, 72-75, 144, 145
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| measuring. See IQ scores
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| question of heritability, 26-34, 73-75, 79, 144-145
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| and race, 28-30, 133-138
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| and twin studies, 31, 73, 74-75
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| In vitro fertilization, 85, 102
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| IQ scores. See also Intelligence
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| adoption studies, 62-63
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| Burt studies, 27-28
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| and illegitimacy, 131-132
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|