If one person who is an identical twin has schizophrenia, the other identical twin is more likely to have to have schizophrenia then someone whose identical twin is not schizophrenic.

30-50%

Explanation:

According to my research, identical twins are 30-50% more likely to have schizophrenia compared to someone who's twin does not suffer from schizophrenia. This is because identical twin's share the exact same DNA as one another. If the twins are fraternal (meaning one is a boy and the other is a girl) then this percentage drops to about 15%.

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