A behavioral geneticist would only want to study identical twins, due to their shared genetic code. Fraternal, or non-identical, twins would not reveal anything interesting in such research.

Question

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While studying identical twins is valuable for understanding the role of genetics in behavior, studying fraternal twins can also provide insights into the interaction of genes and environments. By comparing both identical and fraternal twins, researchers can estimate the degree to which genetic and environmental factors contribute to a particular behavior or trait.

A Behavioral Geneticist Would Only Want to Study Identical Twins