26. Sam believes the Queen of England is in love with him. He does not have any other symptoms. His most likely diagnosis would be A) schizophreniform disorder. B) schizoaffective disorder. C) delusional disorder. D) bipolar disorder with delusions. 27. Family studies of the genetic basis for schizophrenia look at A) the rate of schizophrenia in relatives of patients with schizophrenia. B) concordance for schizophrenia in cultures where incest is relatively common. C) the likelihood that a patient with schizophrenia will have children. D) the effects of being raised by a patient with schizophrenia. 28. The concordance rate of schizophrenia for fraternal twins is about A) 12%. B) 45%. C) 75%. D) 95%. 29. Of schizophrenic symptoms, the ones with the higher genetic component are A) negative symptoms. B) delusions. C) positive symptoms. D) persecution delusions. 30. Which of the following is a limitation of both family studies and twin studies of schizophrenia? A) Both methods employ self-report measures only. B) Both methods use too broad a definition of schizophrenia. C) Neither method accounts for the role of shared-environment. D) Neither method distinguishes between subtypes of schizophrenia. Â Â