Q.Write the five most important events of recombinant DNA technology.

rDNA technology is cut, paste, insert, select, and multiply.

1. Isolation of the gene/DNA fragment of interest -- the desired gene is cut out from the source (donor) organism's DNA, typically using restriction endonucleases that recognise and cleave specific nucleotide sequences.
2. Selection and preparation of a suitable cloning vector -- a vector (e.g. a plasmid or bacteriophage) is cut with the same (or a compatible) restriction enzyme, generating matching sticky or blunt ends able to join with the isolated gene fragment.
3. Ligation -- the isolated DNA fragment (insert) and the cut vector are joined together using the enzyme DNA ligase, which forms phosphodiester bonds sealing the fragment into the vector, producing a recombinant DNA molecule.
4. Transformation -- the recombinant DNA molecule is introduced into a suitable host cell (e.g. E. coli, yeast, or a plant/animal cell) using a method such as heat-shock treatment, electroporation, or (for plants) Agrobacterium-mediated transfer. …