Which type of study supports the contribution of genetic factors to bipolar disorder?

Name: Which type of study supports the contribution of genetic factors to bipolar disorder?
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Question

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Twin studies are instrumental in understanding the genetic contribution to bipolar disorder by comparing the concordance rates of the disorder between monozygotic (identical) twins and dizygotic (fraternal) twins. Higher concordance rates in monozygotic twins as compared to dizygotic twins suggest a genetic contribution.

Which Type of Study Supports the Contribution of Genetic Factors