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I was reading and saw:

[...] the evolution of entire species can be changed by a single mistake in the replication of a strand of DNA (this is one mechanism for mutation).

... implying other mechanisms for mutation exist. Do they?

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Absolutely. Ionizing (X-rays, neutrons, electrons, heavy ions) and non-ionizing radiation (UV), chemicals, etc. are able to induce DNA Damage, which is then imperfectly repaired. So it's not an issue of imperfect replication, but also of imperfect damage repair.

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DNA methylation over CpG doublets can cause mutation since 5mC can undergo spontaneous deamination and covert to a thymine.

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