When does dna polymerase check for mutations

The DNA polymerase checks for mutations at the time of DNA replication.

Explanation:

The DNA polymerase can be described as the enzyme which is involved in the synthesis of the new strand of DNA by using the former strand as a template. When an incorrect nucleotide gets added to the new strand being formed, the DNA polymerase has the capability to go back by one nucleotide pair and correct the mistake. In this way, DNA polymerase is also involved in the checking of mutations.