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Question

# If Meselson and Stahlâ€™s experiment is continued for 5 generations in bacteria, the ratio of 15N15N:15N14N:14N14N in 5th generation would be

A
0 : 1 : 3
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B
0 : 1 : 7
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C
0 : 1 : 15
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D
0 : 1 : 31
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Solution

## The correct option is C 0 : 1 : 15In 1st generation, All DNA will be hybrid Hence the ratio will be 0 Heavy : 1 Hybrid : 0 Light In 2nd generation, 50 % would be Hybrid(15N14N) and 50 % would be Light (14N14N) That is 0 Heavy : 1 Hybrid : 1 Light In 3rd generation, 25 % would be Hybrid and 75 % would be Light DNA 0 Heavy : 1 Hybrid : 3 Light) In 4th generation, 12.5 % would be Hybrid and 87.5 % would be Light DNA (0 : 1 Hybrid : 7 Light) In 5th generation, 6.25 % would be Hybrid and 93.75 % would be Light DNA 0 Heavy : 1 Hybrid : 15 Light).

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