If it can be assumed that MZ and DZ twins are equally similar with respect to non-inherited factors, then twins can be used to get an estimate of the relative contribution of ____ vs. ____ variation to the trait.

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1. If it can be assumed that MZ and DZ twins are equally similar with respect to non-inherited factors, then twins can be used to get an estimate of the relative contribution of ____ vs. ____ variation to the trait.