Earlobe type is an inherited trait and can be described as attached or detached. Earlobe type is a ____________ that is coded by a person’s __________.

An observable trait, such as whether earlobes are attached or detached, is a phenotype. The genetic information that helps determine the trait is the person’s genotype. Therefore, earlobe type is a phenotype coded by a genotype, which is choice D.

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