Causes Of Fibrosis What Is The Mechanism Whereby The Faulty Cystic Fibrosis Gene Causes Production Of Thick Mucus?

What is the mechanism whereby the faulty Cystic Fibrosis gene causes production of thick mucus? - causes of fibrosis

I have a chart showing that the pull. I searched Google for a long time, but did not find much information. (It is of Biology 12)