alleryColonies whose beta galactosidase gene carries an insert appear:
ABlue in colour
BRed in colour
CGreen in colour
DWith no colour
Answer & Solution
Correct answer: D. With no colour
1. The chromogenic substrate turns blue only if the enzyme works.
2. An insert inactivates the gene for that enzyme.
3. So recombinant colonies stay colourless.
_Source: syllabus Biology, Ch 9 'Biotechnology : Principles and Processes'_
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