SOS repair

DNA synthesis by a new DNA polymerase bypasses site of damaged DNA

Cell survives but mutations are generated

parent strain does not. On a medium that contains histidine, both the parent and the histidine auxotroph grow. On a medium lacking histidine, the histidine-requiring mutant will not grow, but the parent will. There is no medium on which the mutant will grow and the parent will not.

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