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 the environment.
A) between a quarter and a third
B) half
C) most
D) very little

Question

Quizplus · Accepted Answer

The fact that unrelated adopted children raised in the same home have IQs correlated at about .32 suggests that environmental factors play a role in IQ, but are not as important as genetic factors. The fact that identical twins raised in different environments have a correlation of .75 suggests that genetic factors are still very important. Taken together with research on the heritability of intelligence, we can conclude that between a quarter and a third of the population variability in intelligence can be attributed to the environment.

Identical Twins Raised in the Same Homes Have IQs Correlated