FIGURE 7.8 The Impact of Nature and Nurture on Intelligence
The most genetically similar people, identical twins, have the strongest correlation between their scores on IQ tests. This suggests that genes play a major role in determining intelligence. But if identical twins are raised in different environments, the correlation is slightly lower, showing some environmental effect (McGue et al., 1993).
The most genetically similar people, identical twins, have the strongest correlation between their scores on IQ tests. This suggests that genes play a major role in determining intelligence. But if identical twins are raised in different environments, the correlation is slightly lower, showing some environmental effect (McGue et al., 1993).