GENERALIZED TRANSDUCTION:
- Any piece of the bacterial genome can be transferred.
- It is done by virulent or lytic bacteriophages.
- Undergoes lytic cycle.
- Bacterial cell lyses quickly.
- Generalized transducing phage produce some particles that contain only DNA obtained from the host bacterium, rather than phage DNA.
- Bacterial DNA hydrolyses by the virus into pieces.
- E.g., E.coli by phage 1.
- No-prophage formation.
SPECIALIZED TRANSDUCTION;
- Only specific pieces of the chromosome can be transferred.
- It is done by temperate phage.
- Undergoes lysogenic cycle.
- Cell survive for several generations.
- A specialized transducing phage produces particles containing both phage and bacterial genes linked in a single DNA molecule.
- Bacterial DNA is not hydrolyzed.
- E.g., lambda-phage.
- Prophages are formed.
No comments:
Post a Comment