Medicine Genetics 18c5a928 Gene mutations in Cystic fibrosis occurs at - A Sho arm of chromosome 7 B Long arm os chromosome 5 C Long arm of chromosome 7 D Sho arm of chromosome .3 High-Yield Explanation In cystic fibrosis, CFTR gene mutation occurs on the long arm of chromosome 7 Reference: Ghai essential pediatrics, 9 th edition, page 392