Question

If e coli was allowed to grow for 80 minutes then what would be the proportions of light and hybrid densities dna molecule?

Answer 1

Excellent Question !!!

Answer :

E coli bacteria divides in every 20 minutes so in 80 minute it will be four generations.

N15 isotope is present in the environment than shifted in N14 environment, so it will result in the presence of N15 and N14 strands in DNA.

In the second generation, half will have the previous hybrid bacteria and half will have the light bacteria.

In the third generation, hybrid generation will again cut half, this time 25% hybrid and 75% light.

In fourth generation, 16 copies will be hybrid and 14 will be light.