If Meselson and Stahl's experiment is co...

If Meselson and Stahl's experiment is continued for four generations in bacteria, the ratio of N15/N15 : N15/N14 : N14/N14 containing DNA in the fourth generation would be

1 : 1 : 0

1 : 4 : 0

0 : 1 : 3

0 : 1 : 7

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