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A Study of 500 Pairs of MZ and DZ Twins

Question 21

Multiple Choice

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.

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