Point mutation SHE HAD ONE MAD CAT AND NE SAD RAT Change in single base-pair e. g G: C to A: T SHE HAD ONE BAD CAT AND ONE SAD RATPoint Mutation Change in single base-pair e.g. G:C to A:T SHE HAD ONE MAD CAT AND ONE SAD RAT SHE HAD ONE BAD CAT AND ONE SAD RAT