The Genetics of Bacteria

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Presentation transcript:

The Genetics of Bacteria

Bacterial Genome: Circular DNA - double stranded . its chromosome in nucleoid Plasmid - small circles of “extra” DNA - not necessary for survival, however - important traits fertility factor, antibiotic resistance

REPLICATION

Bacterial chromo. replicates -two copies move apart -cell grows -plasma membrane pinches -new cell wall deposited

division produces CLONE

Origin of Replication

Replication in both directions

Replication Forks move bidirectionly until they meet

Genetically identical daughter cells (clones)

Genetic Recombination:

Genetic Recombination: `Transformation - uptake of “naked” DNA from the environment Transduction - Conjugation -

Genetic Recombination: `Transformation - uptake of “naked” DNA from the environment into its chromosome.

Genetic Recombination: `Transformation

Genetic Recombination: `Transduction - A phage (virus) transfers bacterial genes from one host cell to another.

Genetic Recombination: `Transduction - A phage (virus) transfers bacterial genes from one host cell to another.

Genetic Recombination: `Transduction - A phage (virus) transfers bacterial genes from one host cell to another.

Genetic Recombination: `Transduction - A phage (virus) transfers bacterial genes from one host cell to another.

Genetic Recombination: `Conjugation - bacterial cells join and transfer genetic material through a sex pilli. F factor = fertility factor

F+ HFR