As a result of a frameshift mutation,
A) one or two nucleotides are added or deleted in a DNA strand.
B) amino acids are assembled into normal, functional proteins.
C) the DNA is always modified in such a way that protein synthesis is prevented.
D) the substitution of one amino acid for another with similar chemical properties has no effect on protein synthesis.

Question

Quizplus · Accepted Answer

A frameshift mutation is when one or two nucleotides are added or deleted in a DNA strand, which alters the reading frame of the genetic code. Since the genetic code is read in groups of three nucleotides, this frameshift alters the entire sequence of codons beyond the point of the mutation. This results in a completely different amino acid sequence for the protein and often leads to a nonfunctional protein.

As a Result of a Frameshift Mutation