The following points highlight the 3 modes of gene transfer and recombination that is genetic germs. The modes are: 1. Transformation 2. Transduction 3. Bacterial Conjugation.
Mode number 1. Transformation:
Historically, the finding of change in bacteria preceded one other two modes of gene transfer. The experiments carried out by Frederick Griffith in 1928 suggested when it comes to time that is first a gene-controlled character, viz. development of capsule in pneumococci, could possibly be used in a non-capsulated selection of these germs. The transformation experiments with pneumococci fundamentally resulted in a discovery that is equally significant genes are made of DNA.
In these experiments, Griffith utilized two strains of pneumococci (Streptococcus pneumoniae): one by having a polysaccharide capsule creating ‘smooth’ colonies (S-type) on agar dishes that was pathogenic. One other stress had been without capsule creating ‘rough’ colonies (R-type) and ended up being non-pathogenic. (more…)