In ............ separated DNA fragments can be visualized with the help of:
Match the following columns and select the correct option.
Column -I Column -II
(a) Bt-cotton (i) Gene therapy
(b) Adenosine deaminase deficiency (ii) Cellular defence
(c) RNAi (iii) Detection of HIV infection
(d) PCR (iv) Bacillus thuringiensis
The sequence that controls the copy number of the linked DNA in the vector, is termed: