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If Meselson and Stahl’s experiment is continued for four generations in bacteria, the ratio of 15^N/15^N: 15^N/14^N: 14^N/14^N containing DNA in the fourth generation would be

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

(a) 1 : 1 : 0

(b) 1 : 4 : 0

(c) 0 : 1 : 3

(d) 0 : 1 : 7

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Correct answer: (d) 0 : 1 : 7

Explanation:

If Meselson and Stahl’s experiment is continued for four generations in bacteria, the ratio of 15N/ 15N : 15N/ 14N : 14N/14N containing DNA in the fourth generation would be 0 : 1 : 7.

After third generation (60 min.) bacteria contains 25% hybrid (15N14N) in 1 :3 ratio. After 4th generation (80 min.) bacteria contains 12.5% hybrid and 87.5% light DNA in 1 : 7 ratio.

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