A researcher finds that for a particular trait, the correlation between identical twins is greater than is the correlation between nontwin siblings. This result demonstrates that

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The fact that the correlation between identical twins is greater than the correlation between non-twin siblings suggests that genetic factors play a larger role in the development of the trait than environmental factors. This is because identical twins share 100% of their genetic material, whereas non-twin siblings only share 50% on average. If environmental factors were more important, we would expect to see higher correlations between non-twin siblings who share similar environments.

A Researcher Finds That for a Particular Trait, the Correlation