What is "Insertional inactivation " ?

Which of the following enzyme will get inactivated in insertional inactivation

Which of the following enzyme will get inactivated in insertional inactivation

How is insertional inactivation of an enzyme used as a selectable marker to differentiate recombinants from non-recombinants?

For selection of recombinants, insertional inactivation of antibiotic marker has been superseded by insertional inactivation of a marker gene coding for a chromogenic substrate. Give reasons.

For selection of recombinants, insertional inactivation of antibiotic marker has been superseded by insertional inactivation of a marker gene coding for a chromogenic substrate. Give reasons.

For selection of recombinants, insertional inactivation of antibiotic marker has been supercoded by insertional inactivation of a marker gene coding for a chromogenic substrate. Give reasons.