Phrenology and craniometry are no longer considered valid methods of studying intelligence.
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Q22: Scientists are now using an expanded definition
Q23: Name five human traits that could be
Q24: The correlation coefficient for totally unrelated people
Q25: DZ twins are no more or less
Q26: All multifactorial traits are polygenic but the
Q28: Davenport and Davenport estimated that two genes
Q29: The heritability of IQ is about 0.5.
Q30: If a trait is genetically determined, the
Q31: The hormone leptin is produced in _
Q32: _ twins result from a single fertilization
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