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Why is the 'insertional inactivation' method to detect recombinant DNA preferred to 'antibiotic resistance' procedure ?

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The presence of a chromogenic substrate gives blue coloured colonies, in absence of an insert/in non-transformants, presence of an insert (in the enzyme site), results into (insertional inactivation of the α-galactosidase) colonies which do not produce colour.

Antibiotic resistance method requires duplicate plating/cumbersome procedure.

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