The parents of two children are normal in respect to Cystic Fibrosis. One of their children is normal, one has Cystic Fibrosis. What is the chance of…

The parents of two children are normal in respect to Cystic Fibrosis. One of their children is normal, one has Cystic Fibrosis. What is the chance of their having another child with Cystic Fibrosis?

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