Genetic and environmental influences on vocabulary IQ: parental education level as moderator.

@article{Rowe1999GeneticAE,
  title={Genetic and environmental influences on vocabulary IQ: parental education level as moderator.},
  author={David C. Rowe and Kristen C. Jacobson and Edwin J.C.G. van den Oord},
  journal={Child development},
  year={1999},
  volume={70 5},
  pages={
          1151-62
        }
}
This article examines how parental education level moderates the genetic and environmental contributions to variation in verbal IQ. Data are from 1909 non-Hispanic Whites and African American sibling pairs from the National Longitudinal Study of Adolescent Health, which obtained nationally-based samples of identical (MZ) twins, fraternal (DZ) twins, full and half siblings, cousins (in the same household), and biologically unrelated siblings. In the whole sample, the variance estimate for… 

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