Question

A e.Coli containing light dna molecule was allowed to grow for 100 minutes in n15 medium then what would be the proportion of light and heavy density dna molecule

Answer 1

Answer:

light DNA= 0% hybrid DNA= 3.3% heavy DNA= 87% (approx.)

Exp

E.coli divides every 20 minutes. After first 20 minutes, when it will replicate in the N15 medium, it is gonna get, 100% hybrid DNA. Proceeding the same way further, after is gonna get 50%  hybrid DNA and 50% heavy DNA. Finallyafter 100 mins. it will get 87% heavy DNA and 3.3% light DNA.

Kindly refer NCERT for the concept of replication. :)