DrSmith's Parents Have Normal Hearing

question 56

Multiple Choice

Dr.Smith's parents have normal hearing.However,Dr.Smith has an inherited form of deafness.Deafness is a recessive trait that is associated with the abnormal allele d.The normal allele at this locus,associated with normal hearing,is D.Dr.Smith's parents could have which of the following genotypes?

• A)DD and dd
• B)Dd and Dd
• C)dd and dd
• D)Dd and DD

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