Leanne is conducting a study in which she is examining the difference in rates of bipolar disorder between monozygotic and dizygotic twins pairs. The term most frequently used to describe this sort of study is

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The study Leanne is conducting is a twin study, as it involves comparing rates of bipolar disorder between monozygotic (identical) and dizygotic (fraternal) twin pairs. Sibling study involves comparing traits or disorders among biological siblings, adoption study involves comparing traits or disorders among adoptees and their biological and adoptive families, matched study involves matching individuals based on certain characteristics to compare their outcomes, and there is no such thing as a zygotic study.

Leanne Is Conducting a Study in Which She Is Examining