Your neighbors' baby girl has just been diagnosed with cystic fibrosis and they have been told that this is an autosomal recessive disorder. They have one child who does not have cys-tic fibrosis
They ask you if their older child, a boy, could have children with cystic fibrosis. What is your best response? A. "Because CF is an autosomal recessive disorder and your older child does not have the disease himself, his children would only be affected if he had children with a woman who has CF."
B. "Because he is a boy and it is your daughter who has CF, he has no risk of passing the problem on to his children."
C. "Because you and your husband are carriers, your son may or may not be a carrier also. If he is a carrier and his wife is also a carrier, it is possible for them to have a child with CF."
D. "Because your son may have one CF gene, it is possible for him to father a child with CF. When he is older, he can find out his CF gene status and risk for passing on the disorder."
C
The development of CF is dependent on inheriting a pair of mutated CF gene alleles, because the disorder is autosomal recessive. Both parents are carriers (heterozygous) with one normal CF gene allele and one mutated CF gene allele. If their son does not have CF, he has two chances out of three of being a carrier for the CF allele and one chance out of three of not being a carrier. If he is a carrier and has children with another carrier, there is a chance he could have a child with CF. He can be tested so that he knows his risk. If he has children with a woman who does not have a mutated CF gene allele, his children may be completely normal (for CF) or may also be carriers.
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