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

Question

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The fact that the correlation between identical twins (who share 100% of their genes) is greater than the correlation between nontwin siblings (who share only 50% of their genes) suggests that genetic factors are important in the development of this trait. If environmental factors were more influential, one would expect nontwin siblings (who share a similar environment) to have a greater correlation in the trait than identical twins (who may have different environmental experiences).

A Researcher Finds That for a Particular Trait, the Correlation