Unattached earlobes are a dominant trait. if a denotes the, Ask an Expert

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Unattached earlobes are a dominant trait. If A denotes the allele for unattached earlobes, and a denotes the allele for attached earlobes, what is (are) the possible genotype(s) of a person who has unattached earlobes? Could both parents of a person with unattached earlobes have attached earlobes? Why or why not?

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