If Meselson and Stahl's experiment is continued for four generati… - Vidyadip

MCQ

If Meselson and Stahl's experiment is continued for four generations in bacteria, the ratio of $\text{15N/15N : 15N/14N : 14N/14N}$ containing $\text{DNA}$ in the fourth generation would be:

A
$1 : 1 : 0.$
B
$1 : 4 : 0.$
C
$0 : 1 : 3.$
✓
$0 : 1 : 7.$

✓

Answer

Correct option: D.

$0 : 1 : 7.$

The ratio of $\ce{15_N / 15_N}$ remains zero in subsequent generation. The ratio of $\ce{15_N / 14_N}$ remains constant $($remains one$)$ and that of $\ce{14_N / 14_N}$ increases. Following figure illustrates this.

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