Imagine that you are a genetic counselor, and a coupleplanning to start a family comes to you for information. Charleswas married once before, and he and his first wife had a childwith cystic fibrosis. The brother of his current wife, Elaine, diedof cystic fibrosis. What is the probability that Charles and Elainewill have a baby with cystic fibrosis. (Neither Charles nor Elainehas cystic fibrosis.)