Which result provides evidence that genes play a role in schizophrenia?
A) Only about 1 percent of the population displays schizophrenia.
B) Children of identical twins, one of whom had schizophrenia, are more likely to develop the disorder, regardless of whether their parent was the twin with schizophrenia or the twin without it.
C) Identical twins are more likely to be discordant for schizophrenia than non-identical twins are.
D) Parents of identical twins with schizophrenia are more likely to show symptoms of the disorder, even after their children's symptoms are in remission.

Question

Quizplus · Accepted Answer

B) This choice indicates a genetic link to schizophrenia because it shows that the likelihood of developing the disorder is increased in children of identical twins where one twin has schizophrenia. This suggests a genetic component, as the risk is tied to the genetic relationship rather than the environmental one. Identical twins share the same genes, so if one twin has schizophrenia, the genes related to the disorder could be passed on to their children, increasing the likelihood of the children developing the disorder, regardless of which twin is the biological parent.

Which Result Provides Evidence That Genes Play a Role in Schizophrenia