If Cecilia has schizophrenia, how likely is it that her dizygotic twin sister Deirdre will also have schizophrenia?

Name: If Cecilia has schizophrenia, how likely is it that her dizygotic twin sister Deirdre will also have schizophrenia?
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Question

Quizplus · Accepted Answer

Dizygotic twins share about 50% of their genes, similar to non-twin siblings. The risk of schizophrenia in a dizygotic twin of an affected individual is approximately 17-20%, making the 18% probability the most accurate estimate among the provided options.

If Cecilia Has Schizophrenia, How Likely Is It That Her