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If Messelson and Stahl’s experiment is continued for four generations with E.coli, what would be the ratio of $^{15} N /^{15} N :^{15} N /^{14} N :^{14} N /^{14} N$ DNA at the end of the fourth generation respectively?

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1:2:1

1:0:7

1:1:1

0:1:7

answer is D.

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Detailed Solution

Generation 1 ___ 0: 1: 0 ( heavy : hybrid : light)

Generation 2 ___ 0: 2: 2 simplified 0: 1: 1(heavy : hybrid : light)

Generation 3 ___ 0:2:6 simplified 0:1:3( heavy : hybrid : light)

Generation 4 ___0:2:14 simplified 0:1:7( heavy : hybrid : light)

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