AP PSYCHOLOGY

Detailed explanation-1: -Identical twins share the same genes. In identical twins, if a twin develops schizophrenia, the other twin has a 1 in 2 chance of developing it, too.

Detailed explanation-2: -Previous studies show that schizophrenia affects both members of identical twins in 41% to 61% of cases, but only 0 to 28% in non-identical twins. A previous pooling of twin studies has suggested that the “heritability” of schizophrenia is 81%.

Detailed explanation-3: -To illustrate, for twins with schizophrenia, 50% identical twins share the disease, while only about 10-15% of fraternal twins do. This difference is evidence for a strong genetic component in susceptibility to schizophrenia.

Detailed explanation-4: -Schizophrenia and heredity The risk jumps to 50 percent if both parents have been diagnosed with schizophrenia, while the risk is 40 to 65 percent if an identical twin has been diagnosed with condition.

Detailed explanation-5: -Results: The probandwise concordance rate of SZ is 33% in monozygotic twins and 7% in dizygotic twins. We estimated the heritability of SZ to be 79%.