Dr Smith's Parents Have Normal Hearing

question 74

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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