Chapter 8: Bacterial Genetics. Important Point:. If you are having trouble understanding lecture material: Try reading your text before attending lectures. And take the time to read it well!. Bacterial Genetics.
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If you are having trouble
understanding lecture material:
Try reading your text
before attending lectures.
And take the time to read it well!
Most bacteria are haploid which means that there is no such thing as dominance-recessive relationships among bacterial alleles.
The mutation rate of different genes usually varies between 10-4 and 10-12 mutations per cell division (essentially equivalent to per cell).
This is one example of isolation of mutants carrying conditionally lethal mutations found in essential genes.
Note that DNA is taken up naked from the environment.
Competence denotes the ability to take up DNA naked from the environment.
Most bacteria are not naturally competent but many can be made artificially so.
Artificially induced competence is very important to gene cloning.
Bacteriophages are viruses that only infect (and can kill) bacteria.
Note multiple resistance genes.
Resistance Transfer Factor (conjugation genes)
Not all incoming DNA is necessarily good for the receiving bacterium (i.e., DNA can be parasitic).
Note in particular that DNA is cut at palindromic regions.