Identical twins raised in the same homes have IQs correlated at about .86. Identical twins raised apart have IQs correlated at about .75. Unrelated adopted children raised in the same home have IQs correlated at about .32. Based on this information and research on the heritability of intelligence, we can say that __________ of the population variability in intelligence can be attributed to theenvironment.
A) between a quarter and a third
B) half
C) most
D) very little

Question

Quizplus · Accepted Answer

The correlation of IQs between unrelated adopted children raised in the same home is .32, indicating that environmental factors contribute to some extent, but not as much as genetic factors, which show higher correlations in identical twins. Thus, between a quarter and a third of the variability can be attributed to the environment.

Identical Twins Raised in the Same Homes Have IQs Correlated