The percentage of Schizophrenia in First degree relatives is: (A) 1.25%, (B) 2.40%, (C) 6.40%, (D) 4.35%
Answer is C. (C) 6.4% # Genetic factors are involved in at least a subset of individuals who develop schizophrenia. Schizophrenia is observe d in 6.6% of all first-degree relatives of an affected proband. If both parents are affected, the risk for offspring is 40%. The concordance rate for monozygotic twins is 50%, compared to 10% for dizygotic twins.