Cystic fibrosis probability problem

Cystic fibrosis affects the cells that produce mucus, sweat, and digestive juices. It causes these fluids to become thick and sticky. They then plug up tubes, ducts, and passageways. Symptoms vary and can include cough, repeated lung infections, inability to gain weight, and fatty stools. Treatments may ease symptoms and reduce complications. Newborn screening helps with early diagnosis. Keywords: Tony, who is not sick, has a sister with cystic fibrosis. His parents are not sick. Tony and Tina are expecting a child. Tina s family history is unknown. If the frequency of heterozygotes in the population is 1, 50, what is the probability that Tony s son has cystic fibrosis , cysticFibrosis, AutosomalRecessive, geneticDisease, geneticDisorder, mutation, Allele, gene