Congenital Deafness in Humans Is Due to the Homozygous Condition

question 13

Multiple Choice

Congenital deafness in humans is due to the homozygous condition of either of the recessive alleles d or e,or both.Both dominant D and E are necessary for normal hearing.Gene D/d affects the middle ear,while gene E/e affects the inner ear.It does not matter how good the normal inner ear (as indicated by E__) is; if there is something wrong in the middle ear,the individual is unable to hear.The same applies for the other gene.What is the phenotypic result of the cross Dd EE x Dd EE?  

• A) 3/4 normal, 1/4 deaf
• B) 9/16 normal, 7/16 deaf.
• C) all normal
• D) 3/4 normal, 1/4 deaf..
• E) all normal.

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