The basic steps involved in the genetic modification of an organism include -
(A) Identification of DNA with desirable genes
(B) Production and clinical trial of drugs
(C) Introduction of the identified DNA into the host
(D) Maintenance of introduced DNA in the host and transfer of the DNA to its progeny
Choose the most appropriate combination from the options given below.
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A), (C) and (D) only
(A) Identification of DNA with desirable genes — A step. It is the first step: finding the DNA that carries the wanted gene.
(B) Production and clinical trial of drugs — Not a step. This belongs to making and testing a product after the organism has been modified (downstream processing), not to the modification itself.
(C) Introduction of the identified DNA into the host — A step. It is the second step: the DNA is put into the host, usually with a vector.
(D) Maintenance of introduced DNA in the host and transfer of the DNA to its progeny — A step. It is the third step: the new DNA must stay and pass to the offspring.