The IQs of identical twins reared apart are usually found to be ________.
A) more highly correlated than the IQs of identical twins reared together
B) higher than those of identical twins reared together
C) very different
D) very similar

Question

Quizplus · Accepted Answer

The best answer is D, because studies have shown that the IQs of identical twins reared apart are very similar. This suggests that genetics play a significant role in determining IQ, as opposed to environmental factors.

The IQs of Identical Twins Reared Apart Are Usually Found