Assume that trait X is primarily an inherited characteristic.Imagine that trait X is investigated using family studies,twin studies,and adoption studies.Briefly describe each of these three methods and indicate what information each would be expected to yield regarding trait X.

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Family studies: There should be more phenotypic similarity on trait X among relatives who share a greater percentage of genes.For example,there should be more similarity on trait X between identical twins than among siblings,who in turn should exhibit more similarity than cousins.
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Twin studies: Identical twins should exhibit more similarity on trait X than fraternal twins.
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Adoption studies: Children adopted in early infancy should more closely resemble their biological parents on trait X than they do their adoptive parents.