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A phenotypically normal couple has had one normal child and a child with cystic fibrosis, an...

A phenotypically normal couple has had one normal child and a child with cystic fibrosis, an autosomal recessive disease.  The incidence of cystic fibrosis in the population from which this couple came is 1/500.  If their normal child eventually marries a phenotypically normal person from the same population, what is the risk that the newlyweds will produce a child with cystic fibrosis?

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