Could both parents of a person with unattached earlobes

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Unattached earlobes are a dominant trait. If A denotes the allele for unattached earlobes, and a denotes the allee for attached earlobes, what are the possible genotypes of a person who has unattached earlobes? could both parents of a person with unattached earlobes have attached earlobes? why or why not?

Reference no: EM13141170

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