If differences in heredity were unimportant for differences in IQ scores,what should we expect?
A)IQ correlations should be equally high for monozygotic and dizygotic twins.
B)IQ correlations should be higher for dizygotic than monozygotic twins.
C)IQ correlations should be higher for monozygotic than dizygotic twins.
D)IQ correlations should be higher for twins reared apart than reared together.

Question

Quizplus · Accepted Answer

If heredity played no role in IQ differences, then the genetic relationship between twins (whether they are monozygotic or dizygotic) would not affect their IQ correlation. Thus, both types of twins would have equally high correlations.

If Differences in Heredity Were Unimportant for Differences in IQ