Answer: Explanation down below!
Explanation: Genetic abnormality causes cystic fibrosis involving the deletion of just three DNA bases, ( a codon ) from the CFTR gene, as you should know. Cystic fibrosis is classified as a recessive genetic disease, which means both copies of a person's CFTR gene have to contain the mutation for the cystic fibrosis to occur.
Hope this helps!
