A study of 500 pairs of MZ and DZ twins done in Kentucky found that in terms of intelligence,
A)the correlations between MZ twins and DZ twins were different.
B)the correlations between DZ twins were about the same as those between other siblings.
C)MZ twins were generally smarter than DZ twins.
D)DZ twins were generally smarter than MZ twins.

Question

Quizplus · Accepted Answer

The study found that the correlations between DZ twins were about the same as those between other siblings, indicating that genetic factors did not play a significant role in determining intelligence. Therefore, there was no significant difference between the intelligence of MZ and DZ twins, making option A, C, and D incorrect.

A Study of 500 Pairs of MZ and DZ Twins