Genetic Recombination in Bacteria

Sexual reproduction (Genetic Recombination):- 3 methods -

a. Conjugation

b. Transformation

c. Transduction

a. Conjugation:- 

> It was first discovered in Escherichia coli by Lederberg and Tatum (1946). 

> Cell contact is required for this method.

b. Transformation:-

> The phenomenon was discovered by Griffith in 1928. Its mechanism was worked out by Avery (1944).

> It is the absorption of DNA segment from the surrounding medium by a living bacterium.

c. Transduction:-

> Transduction was first discovered by Zinder and his teacher Lederberg (1952) in Salmonella typhimurium.

> Here genetic material is transferred by phage virus between two bacteria.