An expert on the genetics of bipolar disorder is asked to describe the evidence collected so far relating genetic factors in the etiology of this disorder. What is she likely to say?

Question

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Numerous studies have suggested that genetic factors play a significant role in the development of bipolar disorder. Family, twin, and adoption studies have all found a higher prevalence of bipolar disorder among close relatives of individuals with the disorder, indicating a genetic predisposition. In fact, a review of studies found that the heritability of bipolar disorder is estimated to be between 59-93%. While other factors such as environmental influences also contribute, the evidence for genetic involvement is quite strong.

An Expert on the Genetics of Bipolar Disorder Is Asked