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 parent with unattached earlobes has genotype EE, and the homozygous parent with attached earlobes has genotype ee. Each offspring receives an E allele from the first parent and an e allele from the second, so all offspring are Ee. Thus, the correct choice is “100 percent Ee.”

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