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 # 1. Transformation:
Historically, the finding of change in germs preceded one other two modes of gene transfer. The experiments carried out by Frederick Griffith in 1928 suggested for the time that is first a gene-controlled character, viz. Development of capsule in pneumococci, might be used in a non-capsulated number of these germs. The transformation experiments with pneumococci fundamentally generated a equally significant finding that genes are made of DNA.
In these experiments, Griffith utilized two strains of pneumococci (Streptococcus pneumoniae): one with a polysaccharide capsule producing ‘smooth’ colonies (S-type) on agar dishes that has been pathogenic. (more…)