Mutations are uncommon because

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Mutations are uncommon because DNA repair enzymes often repair errors, preventing them from becoming permanent mutations. This is one of the primary ways that cells maintain the fidelity of their genetic information. Physical mutagens such as X-rays can cause damage to DNA, but they are still relatively rare occurrences. While DNA can sometimes repair itself over time, it is typically reliant on the action of repair enzymes to do so, and not all types of damage can be repaired in this way. Frameshift mutations occur relatively infrequently, as they require the addition or removal of a significant amount of genetic information. Transposons can move throughout the genome, but they typically do not cause mutations unless they land in a sensitive area of the genome, such as a gene.

Mutations Are Uncommon Because