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CGP EDU Academic Team
Published on: August 13, 2026
Direct visual selection method for the selection of recombinant host cells on the basis of their inability to produce, colour in the presence of chromogenic substrate can be applied if the vector used is a
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A
The blue-white screening method uses the lacZ (β-galactosidase) reporter gene in modified E. coli plasmid vectors. Recombinant colonies cannot produce the blue color in the presence of a chromogenic substrate (X-gal), so they appear white.
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