Identical twins have IQ correlations around 0.7, whereas fraternal twins have IQ correlations of about 0.3. What do these correlations suggest?

Question

Quizplus · Accepted Answer

The higher correlation of IQ scores in identical twins (0.7) suggests that they have a stronger genetic influence on IQ than fraternal twins (0.3), who share only about half of their genes. Therefore, identical twins are more likely to have very similar IQs while fraternal twins are not as likely.

Identical Twins Have IQ Correlations Around 0