Unattached earlobes is a dominant trait, E. A parent who is homozygous for unattached earlobes is crossed with a parent who is homozygous for attached earlobes. Which describes the genotypes of their offspring?

The homozygous unattached-earlobe parent has genotype EE, and the homozygous attached-earlobe parent has genotype ee. Each offspring receives E from the first parent and e from the second, so all offspring are Ee. The correct choice is “100 percent Ee.”

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