![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | Inherited tendencies. See Heritability
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![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | Intelligence. See also IQ scores
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![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | Burt studies, 27-28
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![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | environmental factors, 72-75, 144, 145
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![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | measuring. See IQ scores
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![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | question of heritability, 26-34, 73-75, 79, 144-145
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![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | and race, 28-30, 133-138
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![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | and twin studies, 31, 73, 74-75
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![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | In vitro fertilization, 85, 102
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![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | IQ scores. See also Intelligence
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![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | adoption studies, 62-63
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![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | Burt studies, 27-28
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![](/files/03/02/28/f030228/public/bd014e5cf10977d319edfaab72ea3d1a.gif) | and illegitimacy, 131-132
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