The following points highlight the 3 modes of gene transfer and hereditary recombination in germs. The modes are: 1. Transformation 2. Transduction 3. Bacterial Conjugation.
Mode no. 1. Transformation:
Historically, the development of change in germs preceded one other two modes of gene transfer. The experiments carried out by Frederick Griffith in 1928 suggested when it comes to very first time that a gene-controlled character, viz. Development of capsule in pneumococci, could possibly be utilized in a non-capsulated number of these germs. The transformation experiments with pneumococci ultimately resulted in a discovery that is equally significant genes are constructed with DNA.
Within these experiments, Griffith used two strains of pneumococci (Streptococcus pneumoniae): one with a polysaccharide capsule producing ‘smooth’ colonies (S-type) on agar dishes that has been pathogenic. Continue reading “Exactly about Gene Transfer and Genetic Recombination in Bacteria”