The most commonly occurring mutation in people with cystic fibrosis is a deletion of a single codon. what is the result of this type of mutation?

A buildup of sticky mucus on the outside of the cell  

Explanation:

The deletion of the codon means that the protein the gene codes for is missing one amino acid.

That protein acts as a Cl⁻ channel in the cellular membrane and controls the movement of water in the tissues.

The water produces thin, freely flowing mucus. Without the water, a coating of thick mucus builds up on the outside of the cell.

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