A study by Kendler and his colleagues involving twins was designed to investigate the etiology of depression. What was one of the major conclusions?
a. Genetics plays a small role in depression.
b. The environment plays a major role in depression.
c. Genetic factors seem to influence the effect the environment may have on depression.
d. Twins are relatively immune from depression as a result of the close bond that they form with each other.
Answer: c.
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