The best place to start for information is <a target=_blank class=ftalternatingbarlinklarge href="http://www.cff.org/
">http://www.cff.org/
</a>
<b>What Is Cystic Fibrosis?</b>
Cystic fibrosis is an inherited chronic disease that affects the lungs and digestive system of about 30,000 children and adults in the United States (70,000 worldwide). A defective gene and its protein product cause the body to produce unusually thick, sticky mucus that: clogs the lungs and leads to life-threatening lung infections; and obstructs the pancreas and stops natural enzymes from helping the body break down and absorb food.
<b>How do people get cystic fibrosis?</b>
Cystic fibrosis is a genetic disease. That means people inherit it from their parents through genes (or DNA), which also determine a lot of other characteristics including height, hair color and eye color. Genes, found in the nucleus of all the body's cells, control cell function by serving as the blueprint for the production of proteins.
The defective gene that is responsible for causing cystic fibrosis is on chromosome 7. To have cystic fibrosis, a person must inherit two copies of the defective CF gene - one copy from each parent. If both parents are carriers of the CF gene (i.e., they each have one copy of the defective gene), their child will have a 25% chance of inheriting both defective copies and having cystic fibrosis, a 50% chance of inheriting one defective copy and being a carrier, and a 25% chance of not having CF or carrying the gene.