The following points highlight the 3 modes of gene transfer and genetic recombination in germs. The modes are: 1. Transformation 2. Transduction 3. Bacterial Conjugation.
Mode no. 1. Change:
Historically, the finding of change in germs preceded one other two modes of gene transfer. The experiments conducted 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 utilized in a variety that is non-capsulated of germs. The transformation experiments with pneumococci ultimately resulted in a discovery that is equally significant genes are constructed with DNA.
Within these experiments, Griffith utilized two strains of pneumococci (Streptococcus pneumoniae): one with a polysaccharide capsule creating ‘smooth’ colonies (S-type) on agar plates that has been pathogenic. (suite…)