Mutation is an alteration in the sequence of DNA of an organisms. Bacteria undergoes mutation when it is under stress. It gives rise to DNA variants that makes the possibility of its survival and reproduction. Mutation can weaken the bacteria. This mutation in bacteria can happen before it undergoes division. It is a permanent modification in the DNA's sequence of nitrogenous bases. It can be a result of an error in the replication of DNA or by certain mutagens.
