The presence of schizophrenia was measured in both monozygotic (MZ) and dizygotic (DZ) twins. The correlation between the MZ twins was .50 and the correlation between the DZ twins was .30. What is the heritability coefficient for schizophrenia?
A) .80
B) .20
C) .40
D) .65

Question

Quizplus · Accepted Answer

The heritability coefficient for schizophrenia can be estimated using the formula 2(rmz - rdz), where rmz is the correlation for monozygotic twins and rdz is the correlation for dizygotic twins. Plugging in the given values, we get 2(.50 - .30) = .40.

The Presence of Schizophrenia Was Measured in Both Monozygotic (MZ)