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| DeFries, J. C. | 3 |
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| Wadsworth, Sally J. | 1 |
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| Journal Articles | 3 |
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Peer reviewedDeFries, J. C. – Journal of Learning Disabilities, 1989
A study applied the polygenic threshold model to previously reported differences in gender ratios among children with reading disabilities and close family members with similar disabilities. The results were found to be predictable with the model. (MSE)
Descriptors: Elementary Secondary Education, Heredity, Models, Parents
Peer reviewedWadsworth, Sally J.; Knopik, Valerie S.; DeFries, J. C. – Reading and Writing: An Interdisciplinary Journal, 2000
Analyzes composition reading performance data from identical and fraternal twin pairs in order to test the hypothesis that genetic influences are more important as a cause of reading disability in girls than in boys. Provides little or no evidence for the hypothesis of greater genetic influence on reading difficulties in girls than in boys. (SC)
Descriptors: Elementary Education, Genetics, Heredity, Reading Difficulties
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
