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Psychology QUESTION #9884
Question 1
Chromosomal mapping studies have found that:
  • Schizophrenia does not appear to have a genetic component
  • Schizophrenia does appear to have a genetic component✔️
  • Adoption studies do not reveal anything about schizophrenia
  • There is a single cause of schizophrenia
Correct Answer Explanation
Twin and chromosomal studies establish that schizophrenia has a significant genetic component. Identical twins show ~48% concordance vs ~17% for fraternal twins. However, no single gene causes it — schizophrenia is polygenic.