Questions
The colonies of recombinant bacteria appear white in contrast to blue colonies of non-recombinant bacteria because of
detailed solution
Correct option is C
A recombinant DNA is inserted within the coding sequence of an enzyme, β-galactosidase. This results into inactivation of the gene for synthesis of this enzyme, which is referred to as insertional inactivation. The presence of a chromogenic substrate gives blue coloured colonies if the plasmid in the bacteria does not have an insert. Presence of insert results into insertional inactivation of the β-galactosidase gene and the colonies do not produce any colour, these are identified as recombinant colonies.Similar Questions
The gene of lac operon that can be used as selectable marker in genetic engineering to identify the recombinant transfromants from non-recombinant transformants is
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