Question

In Meselson--Stahl's experiment, if DNA of E.coli is extracted after 40 minutes, what will be the densities of DNA molecules formed (2nd generation)?

• A. 25% hybrid and 75% light
• B. 75% hybrid and 25% light
• C. 40% hybrid and 60% light
• D. 50% hybrid and 50% light

Hint:

20 minutes $\rightarrow$ 100% Hybrid 40 minutes $\rightarrow$ 50% Hybrid + 50% Light 60 minutes $\rightarrow$ 25% Hybrid + 75% Light

Answer 1

The Correct Option is D