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what types of mutation would change the reading fram of DNA resulting in a frameshift mutation?

what types of mutation would change the reading fram of DNA resulting in a frameshift mutation?
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In order to bring about a frameshift mutation, the entire reading frame of the mRNA has to be changed. It can be done through two types of mutations namely insertion or deletion. These insertions or deletions should be either of 1 nucleotide or 2 nucleotide but not of 3 consecutive nucleotide. This is because an insertion or deletion of 3 consecutive nucleotides will just change a single amino acid.

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