Answer:
Selectable marker are antibiotic resistance gene and gene coding for enzyme P galactosidase. When foreign DNA is inserted into these marker genes, they inactivate and lose their activity. This insertional inactivation leads to screening of transformed cells from non-transformed ones.
(i) Insertional inactivation of antibiotic reaction gene allowing transformed cells to grow only on antibiotic for media.
(ii) Inactivation of gene coding for enzyme \[\beta \] galactosidase which gives blue colour in presence of chromogenic substrates in culture media.
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