Which statement about genetic factors in schizophrenia is accurate?

A) Close relatives of those with schizophrenia are more likely to be diagnosed with schizophrenia than distant relatives of those with schizophrenia.
B) Fraternal twins have a higher concordance rate for schizophrenia than do identical twins.
C) Those with schizophrenia who have been adopted are more like their adoptive parents than like their biological parents.
D) Recent family studies eliminate the confounding of environment and genetics.

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Mauricio Ramos · Accepted Answer

Final Answer : A, Explanation :  Close relatives, such as siblings or children, of individuals with schizophrenia have a higher risk of developing the disorder compared to the general population or distant relatives. This suggests a genetic component to the disorder. Identical twins have a higher concordance rate than fraternal twins, indicating genetics play a significant role. Adoptive studies show that individuals with schizophrenia are more similar to their biological relatives than to their adoptive families in terms of the risk of developing the disorder, highlighting the influence of genetics over environment. Family studies have not been able to completely eliminate the confounding effects of environment and genetics, as both play roles in the development of schizophrenia.

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