TS EAMCET Medical 2016 Paper

After insertion of a DNA segment within the sequence of z-gene of bacteria, they are grown on chromogenic substrate. After the growth of bacterial colonics, they are identified as
(I) Recombinants if colonies are blue coloured
(II) Recombinants if colonies are white coloured
(III) Non-recombinants if colonies are blue coloured
(IV) Non-recombinants if colonies are white coloured
Identify the correct pair