[b_sharp]

Because mutations are pseudo-random...

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The initial occurrence of a mutation is always random. Whether that mutation is passed to the next generation is not. There are some areas of the genome where mutations are frequently corrected. In this way there are some areas of the genome where mutations are less likely to occur, thus pseudo-random.

[Elsie]

There are some areas of the genome where mutations are frequently corrected.

Then how would we know it mutated or not??