Identical twins have IQ correlations around 0.7,whereas fraternal twins have IQ correlations of about 0.3.What do these correlations suggest?
A)Identical twins have very similar IQs while fraternal twins do not.
B)Neither identical twins nor fraternal twins have very similar IQs.
C)Fraternal twins have very similar IQs while identical twins do not.
D)Both identical twins and fraternal twins have similar IQs.

Question

Quizplus · Accepted Answer

The correlations suggest that there is a stronger genetic influence on IQ for identical twins than for fraternal twins. This is because identical twins share 100% of their genes, while fraternal twins share only 50% on average. Therefore, the higher correlation for identical twins implies that genetics play a larger role in determining IQ than environmental factors.

Identical Twins Have IQ Correlations Around 0