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?

Question

Quizplus · Accepted Answer

Dr. Smith's parents must both be carriers of the recessive allele (Dd) to have normal hearing themselves but still pass on the recessive allele (d) to Dr. Smith, resulting in his dd genotype and inherited deafness.

DrSmith's Parents Have Normal Hearing