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

Question

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 (A) 1 :1 :0  (B) 1: 4: 0  (C) 0: 1: 3 (D) 0: 1: 7

Tardigrade Admin · Accepted Answer

As per Meselson and Stahl's experiment, parent DNA was first isolated from E.coli grown in heavy 15N medium. It was then put in light 14N medium. DNA shows semi conservative nature, hence, in fourth generation, the ratio of 15N/15N: 15N/14N: 14N/14N will be 0 :1: 7.

Q. If Meselson and Stahl's experiment is continued for four generations in bacteria, the ratio of $^{15} N /^{15} N :^{15} N /^{14} N :^{14} N /^{14} N$ containing $D N A$ in the fourth generation would be

$1 : 1 : 0$

$1 : 4 : 0$

$0 : 1 : 3$

$0 : 1 : 7$

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

1:1:0

1:4:0

0:1:3

0:1:7

As per Meselson and Stahl's experiment, parent DNA was first isolated from E.coli grown in heavy 15N medium. It was then put in light 14N medium. DNA shows semi conservative nature, hence, in fourth generation, the ratio of 15N/15N:15N/14N:14N/14N will be 0:1:7.

Q. If Meselson and Stahl's experiment is continued for four generations in bacteria, the ratio of $^{15} N /^{15} N :^{15} N /^{14} N :^{14} N /^{14} N$ containing $D N A$ in the fourth generation would be

$1 : 1 : 0$

$1 : 4 : 0$

$0 : 1 : 3$

$0 : 1 : 7$