Question

Which of the following statements is true of the role of genes and environment in the development of schizophrenia? A)Twin studies indicate that genes contribute to the development of schizophrenia, and genome-wide association studies have identified the particular genes. B)Twin studies indicate that the concordance rate for MZ twins is 100%, suggesting that genes are the only factor influencing the development of schizophrenia. C)Twin studies indicate that genes contribute to the development of schizophrenia, but because the concordance rate for MZ twins is only 48%, the environment must play a role. D)Twin studies indicate that the concordance rate for MZ twins is 0%, suggesting that genes play no role in influencing the development of schizophrenia.

Answer 1

Twin studies indicate that genes contribute to the development of schizophrenia, but because the concordance rate for MZ twins is only 48%, the environment must play a role. The correct answer is option C.

Step-by-step explanation:

Option C is the correct answer, Twin studies have been instrumental in understanding the interplay between genes and the environment in the development of schizophrenia.

While option A is partially correct in stating that genes contribute to schizophrenia, it oversimplifies by suggesting specific genes have been definitively identified.

Option B's claim of a 100% concordance rate for MZ twins is incorrect; the rate is around 48%, supporting the involvement of environmental factors.

Option D, suggesting a 0% concordance rate, is also incorrect. The moderate concordance rate in MZ twins suggests a complex interaction between genetic predisposition and environmental influences in schizophrenia.

Option C is the answer.