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Biology · 2025 · 1 mark
CBSE 2025 · Region 2 · Set 1 · Q10
If Meselson and Stahl's experiment is continued for 80 minutes (till III generation) then what would be the ratio of DNA containing N^15 / N^15: N^15…
If Meselson and Stahl's experiment is continued for $\displaystyle 80$ minutes (till III generation) then what would be the ratio of DNA containing $\displaystyle \mathrm{N}^{15} / \mathrm{N}^{15}$ : $\displaystyle \mathrm{N}^{15} / \mathrm{N}^{14}: \mathrm{N}^{14} / \mathrm{N}^{14}$ in the medium ?
Official answer
(B)
$\displaystyle 0$ : $\displaystyle 1$ : $\displaystyle 3$
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.