Which of the following statements is supported by research on the role of genetic influences in unipolar disorder?
A. The prevalence of mood disorders is two to three times higher among those with blood relatives who have clinically diagnosed unipolar depression.
B. Twin studies do not consistently find evidence of an inherited susceptibility to depression.
C. Genes play a more significant causal role in bipolar disorders than they do in unipolar disorders.
D. Bipolar and unipolar disorders are equally heritable.
Answer: A
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