Col factors: Plasmids which contain genes that code for extracellular toxin (colicines) production that inhibit strains of the same and different species of bacteria. F(fertility) factors: Plasmids that can bacterial chromosome. It promotes transfer of the chromosome at a high frequency of recombination into the chromosome of a second (recipient) bacterial cell during mating. recombine itself with the
Genetic variation in Bacteria
Mechanisms: Mutation and Gene transfer
1. Mutation: It is due to a chemical alteration in DNA. It could be spontaneous or induced by chemical and physical meanses Mutants are variants in which one or more bases in their DNA are altered; which are heritable and irreversible
Types of mutation
1. 2. 3 .
Substitution: Change of a single base. Deletion: Los of a base. Insertion: Addition of a base .
2. Gene transfer There are three types of gene transfer that alter the DNA gene content of bacteria.