The mutations found in the CF gene that result in cystic fibrosis are recessive because
A)Normal or near normal cellular function can occur from the protein produced by the normal allele
B)The CF mutations that occur result in no protein being produced
C)CF mutations only result in a protein that has normal function if there is also a normal CF protein in the cell.
D)CF is fatal and if the alleles that caused CF were dominant it would not be inherited.

Question

Quizplus · Accepted Answer

Recessive alleles require two copies to be expressed, whereas dominant alleles only require one copy. In the case of cystic fibrosis, the mutations found in the CF gene result in a malfunctioning protein or no protein being produced, but normal or near normal cellular function can occur from the protein produced by the normal allele present on the other chromosome. This means that an individual with only one copy of the mutated CF gene is a carrier but does not exhibit the disease phenotype. Therefore, the mutations are recessive.

The Mutations Found in the CF Gene That Result in Cystic