The mutations found in the CF gene that result in cystic fibrosis are recessive because
A)the protein produced by the normal allele is sufficient for normal cellular function.
B)the CF mutations always result in no protein being produced.
C)CF mutations result in a protein that has normal function only if normal CF protein also exists in the cell.
D)dominant alleles that cause a fatal disorder, such as cystic fibrosis, cannot be inherited.

Question

Quizplus · Accepted Answer

The protein produced by the normal allele is sufficient for normal cellular function, meaning that individuals with one normal allele and one mutated allele (heterozygotes) do not exhibit symptoms of cystic fibrosis. This is characteristic of recessive mutations, where two copies of the mutated gene are required to manifest the disorder.

The Mutations Found in the CF Gene That Result in Cystic