The most commonly occurring mutation in people with cystic fibrosis is a deletion of a single codon. this mostly likely results in

It would result in a polypeptide which has a missing amino acid.  The genetic mutation that occurs in a person with cystic fibrosis is called frameshift mutation which is caused by an insertion or deletion of nucleotides that is not divisible by three in a sequence of DNA.

straight or amphibians are homeothermic to thermal

thinking it would be physical characteristics