Molly has been diagnosed with schizophrenia. What is the approximate likelihood that her identical twin will also be diagnosed with schizophrenia at some point in her life?

Question

Quizplus · Accepted Answer

Twin studies have consistently shown that the probability of a monozygotic (identical) twin developing schizophrenia if the other twin has been diagnosed is around 50 percent. This suggests that genetic factors play a significant role in the development of schizophrenia. However, it's important to note that not all identical twins with a schizophrenic co-twin will develop the disorder themselves, indicating that environmental factors also play a role.

Molly Has Been Diagnosed with Schizophrenia