Which of the following mutations would still allow protein X to be functional?
A) A missense mutation in the third codon of gene X
B) A silent mutation in the third codon of gene X
C) A deletion of the first three codons of gene X
D) A frame-shift mutation in the third codon of gene X
E) A nonsense mutation in the third codon of gene X

Question

Quizplus · Accepted Answer

A silent mutation in the third codon of gene X would not change the amino acid sequence of protein X and therefore would not affect its function. The other mutations listed (A, C, D, and E) would change either the amino acid sequence or reading frame of the gene, which would likely result in a non-functional protein.

Which of the Following Mutations Would Still Allow Protein X