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| Intelligence | 1 |
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| DeFries, J. C. | 1 |
| Plomin, Robert | 1 |
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| Information Analyses | 1 |
| Journal Articles | 1 |
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Peer reviewedPlomin, Robert; DeFries, J. C. – Intelligence, 1980
Extensive data on twins, nontwin siblings, siblings separated by adoption, and parent-child similarity indicate that the heritability of intelligence is closer to .50 than to .70. Differences could be due to environmental or genetic changes in the population, or to methodology. (Author/CP)
Descriptors: Adopted Children, Correlation, Environmental Influences, Family Influence
