Accelerate NEET 2020: Molecular Basis of Inheritance-04

Which of the following phenomena was experimentally proved by Meselson and Stahl?

First experimental proof for semi-conservative DNA replication was shown in

The semi-conservative nature of DNA replication was established by Meselson and Stahl in their classic experiment with bacteria. They grew bacteria in N^15- NH4CI containing medium, washed and then incubated in fresh medium with N^14- containing compounds and allowed to grow for three generations. CsCl density gradient centrifugation of isolated DNA established the nature of semiconservative DNA replication. The pictorial representation below shows the position of differentially labeled DNA in CsCl density gradient.

Had the DNA replication been conservative, what would have been the pattern?

If both the DNA strands containing radioactive thymidine are allowed to duplicate in a non-radioactive thymidine containing medium, then what will be the total number of DNA molecules that consist of strands of radioactive thymidine ?