CFTR is a protein essential to wet surfaces throughout your body, like the airways of your lungs. People with cystic fibrosis have a gene mutation that causes problems with the protein. Some ...
Someone who is homozygous (ff) for the recessive allele will develop cystic fibrosis. Someone who is heterozygous (Ff) or homozygous (FF) for the dominant allele will not develop cystic fibrosis. In ...