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Mutation (Chromosome mutation (Deletion - a section of chromosome breaks…

- - - - Breaks one or both DNA strand
        Some breaks can be repaired but mutations can occur in the process
  - - - Chemically alters bases in DNA
        e.g. converting cytosine to uracil
  - - - Methyl or Ethyl groups are attached to bases resulting in the incorrect pairing of bases during replication
    - - Incorporated into DNA in place of the usual base during replication , changing base sequence
    - - Viral DNA may insert itself into a genome, changing the base sequence