Genetic Studies on Schizophrenia Have Shown That ____

Genetic studies on schizophrenia have shown that ____.

A) if an identical twin develops schizophrenia, the other twin has a 90% probability of also developing schizophrenia
B) the more genetically similar you are to a person who has schizophrenia, the more likely you will also develop the disorder
C) although the disorder is thought to have biological causes, it is not inherited
D) the disorder is the result of inappropriate cross-over gene material during meiosis, similar to what happens in Down's syndrome