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 ∶ 1 ∶ 0
2
1 ∶ 4 ∶ 0
3
0 ∶ 1 ∶ 3
4
0 ∶ 1 ∶ 7

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