Homework Answers
The allele for deafness is recessive. Two normal parents can only produce a deaf child whem they both are carriers (or heterozygous). Considering these facts, the genotype of Dr. Smith's parents would be Dd.
A cross between Dd X Dd is given below:
| D | d | |
| D | DD | Dd |
| d | Dd | dd |
The chances of a homozygous recessive child is, therefore, 1/4. This child will have the trait of deafness.
The chances of having a girl child with deafness in this cross would be (1/2*1/4) = 1/8.
Note that we have multipled 1/4 with 1/2 because the probability of having a girl child is 1/2.
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