In this article we will discuss about the definition of conjugation in bacteria. The occurrence of recombination by sexual union was first shown experimentally in 1946 by Joshua Lederberg and E.L. Tatum in E. coli. They took two auxotrophic strains neither of which could grow on minimal medium due to mutation in genes controlling synthesis of vitamins thiamine and biotin, [...]
In this article we will discuss about:- 1. Discovery of Transformation 2. Process of Transformation 3. Competence 4. Linkage and Gene Mapping. Discovery of Transformation: The phenomenon was first discovered in 1928 from Griffiths experiment with Diplococcus pneumoniae. As this historical experiment has been instrumental for identification of DNA as a hereditary material. Briefly, when a suspension containing a mixture [...]
In this article we will discuss about the meaning and types of transduction of bacteria. Meaning of Transduction: The transfer of a small part of a bacterial genome from a donor to recipient bacterium through the agency of a bacteriophage is called transduction. It may be general or specialised. In generalized transduction almost any part of the donor's chromosome may [...]