NEET Zoology Recombinant DNA Assertion Reason Question
Assertion (A): Insertional inactivation results in the production of blue colonies when a chromogenic substrate is present.
Reason (R): A recombinant DNA, when inserted within the coding sequence of β-galactosidase, inactivates the gene for enzyme synthesis.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is not the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
Correct Answer
Detailed Explanation
The NCERT context states that insertion of recombinant DNA inactivates the β-galactosidase gene, resulting in white colonies, not blue. Thus, (A) is false and (R) is true.
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