A report in a research journal describes the symptoms of a mental disorder along with information on its etiology, including a heritability of 50 percent. How should this finding be interpreted?
a. Genetic factors and the environment contribute about equally to this disorder.
b. Half of the people who suffer from the disorder have a genetically caused disorder.
c. Half of the children of carriers of this disorder will actually develop the disorder.
d. Geneticists have identified half of the genes thought to be responsible for this disorder.
Question 2
The best evidence for the influence of nongenetic factors in the cause of mood disorder is in the
a. concordance rates for MZ twins, which are less than 100 percent.
b. concordance rates for DZ twins, which are less than 100 percent.
c. concordance rates for MZ twins, which are less than for DZ twins.
d. concordance rates for DZ twins, which are less than for MZ twins.
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