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Q.

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:

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a

1:1:0

b

0:1:7

c

1:4:0

d

0:1:3

answer is D.

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Detailed Solution

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Total 16 daughter DNA molecules are formed, out of which 15N/15N are zero, 15N/14N are two and 14N/14N are fourteen. Therefore answer is 0 : 1 : 7.

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