In studies of the correlation of IQ scores among twins, the correlation of scores of monozygotic twins raised apart is
A)higher than for monozygotic twins raised together.
B)lower than for dizygotic twins raised apart.
C)higher than for dizygotic twins raised together.
D)the same as for monozygotic twins raised together.
E)the same as for dyzygotic twins raised together.

Question

Quizplus · Accepted Answer

The correlation of IQ scores for monozygotic (identical) twins, whether raised together or apart, tends to be higher than for dizygotic (fraternal) twins. This is because monozygotic twins share more genetic material than dizygotic twins, making their IQ scores more similar regardless of their environment.

In Studies of the Correlation of IQ Scores Among Twins