Jack, age 20, has been diagnosed with schizophrenia. Doctors told Frank, a family member, that this means he has a 50 percent chance of developing schizophrenia. Frank is likely Jack's

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Monozygotic twins, also known as identical twins, share 100% of their genes. Therefore, if one monozygotic twin is diagnosed with schizophrenia, the other twin has a significantly higher risk of developing the condition compared to other family relationships. Studies have shown that the risk for the other monozygotic twin is about 40% to 50%, reflecting the high genetic component of schizophrenia.

Jack, Age 20, Has Been Diagnosed with Schizophrenia