A patient with bipolar disorder asks the nurse what caused the illness. What will the nurse tell the patient regarding the genetic transmission of bipolar disorder?
1. Bipolar disorder is caused by environmental factors.
2. There is one single gene responsible for bipolar disorder.
3. There is no known cause for the development of bipolar disorder.
4. There appears to be a genetic link in the transmission of bipolar disease.
Answer: 4
Explanation: There appears to be about a 60% heritability factor in the transmission of bipolar disease. The environment acts in concert with genotype for the expression of mental disorders. There is no single gene responsible for any mental disorder. The exact cause of bipolar disorder is not known, but there appear to be heritability factors.
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