Twin studies suggest that schizophrenia
A) is caused entirely by genetic factors.
B) is caused entirely by environmental factors.
C) is likely caused by a combination of genetic and environmental factors.
D) is more likely to occur in twins than non-twins.

Question

Quizplus · Accepted Answer

Twin studies suggest that schizophrenia is highly heritable but not entirely genetic, as monozygotic (identical) twins only have a 50% concordance rate for the disorder. This suggests that environmental factors also play a role in the development of schizophrenia. Therefore, it is likely caused by a combination of genetic and environmental factors.

Twin Studies Suggest That Schizophrenia