What are the two main discoveries that led to the built of genetic engineering ?
Answer. Genetic engineering is the technique to form recombinant DNA and then to introduce recombinant DNA into appropriate host. Two main discoveries which led to genetic engineering are :
(i) Discovery of plasmid by William Hays and Joshua Lederberg in 1952.
(ii) Discovery of restriction endonuclease by Arber in 1962.
