Michael and Michelle Are Adolescents Who Share the Same Birthday

question 6

Multiple Choice

Michael and Michelle are adolescents who share the same birthday. Michael received a diagnosis of bipolar disorder. On the other hand, Michelle shows no signs of mood disturbance. In this example:

• A) Michael and Michelle are most likely monozygotic twins, but Michael is genetically predisposed to develop a mood disorder.
• B) Michael and Michelle are most likely dizygotic twins, but Michael developed the disorder because he modeled behaviors of other family members.
• C) Michael and Michelle are most likely dizygotic twins, but Michelle did not develop the disorder because the concordance rate for dizygotic twins is usually low.
• D) Michael and Michelle are most likely monozygotic twins, but Michelle did not develop the disorder because she has a higher tolerance for stress.

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