Answer: Frame shift mutation.
Explanation: An addition or deletion of one or more nucleotides during DNA replication causes a frame shift mutation. A frameshift is a type of mutation that changes the reading frame of the DNA. Because amino acids are coded for by three nucleotide sequences on the mRNA, an addition of an extra nucleotide in the DNA sequence during replication, will result to an mRNA with an extra nucleotide in its sequence and this will alter the reading frame during protein synthesis. The consequence of this is that wrong amino acids will be incorporated into the amino acid sequence of the protein from the point of the mutation to the end of the nucleotide sequence. This will result in a nonfunctional protein.
