CBSE 2025 · Region 7 · Set 1 · Q16 · 1 mark
Assertion (A) : A piece of DNA inserted into an alien organism generally does not replicate, if not inserted into a chromosome. Reason $\displaystyle (R)$ : Chromosomes have specific sequences called 'ori' region, where DNA replication is initiated.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Biotechnology : Principles and ProcessesProcesses of Recombinant DNA TechnologyUnderstandassertion_reasonmedium
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CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.