Question

If meselson and stahl's experiment is continued for four generations in bacteria, the ratio of 15n/ 15n : 15n/ 14n : 14n/ 14n containing in the fourth generation would be:

Answer 1

Answer:

0:1:7

Explanation:

in fourth generation we get 2 hybrids (n14/n15) and 14 light (n14/n14) and 0 heavy (n14/n14)

so answer will be 0:1:7

Answer 2

Meselson and Stahl  

Explanation:

Watson and Crick proposed the hypothesis of semi conservative DNA replication but proved by Meselson and Stahl

• Each DNA strand act as a template for synthesis of new strand
• Each DNA produce two new DNA molecule,each with one new strand and one old strand called semi conservative replication(half of the parental DNA conserved in daughter DNA)
• 15N medium is heavy DNA
• 14N DNA is light DNA
• 15N-14N is hybrid DNA
• The ratio of 15N/ 15N : 15N/ 14N : 14N/ 14N containing in the fourth generation would be= 0:1:7