According to family, twin, and adoption studies, a person is at greatest risk for developing schizophrenia if he or she has a(n)
A) identical twin diagnosed with the disorder.
B) nonidentical twin diagnosed with the disorder.
C) adoptive parent diagnosed with the disorder.
D) biological parent diagnosed with the disorder.
Answer: A
Rationale: If one identical twin has schizophrenia, the other twin has a 25% to 50% chance of developing it. This rate is significantly higher than those for other types of familial relationships.
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a. death of his wife b. marriage to his long-time girlfriend c. retirement from his job d. having his youngest child leave home