do both parents have to have a gene for a child to get cystic fibrosis
Cystic fibrosis is an inherited disease. For someone to get cystic fibrosis, both parents must be carriers of the gene that causes it and then pass it on. If both parents are carriers, there is a 25% chance that each pregnancy will result in a child born with cystic fibrosis. Boys and girls are equally likely to get the disease.