Genetics - Analysis and Principles 3rd Edition by Robert Brooker

تمرين 1

Answer the following questions that pertain to the experiment of Figure 11.3.
A. What would be the expected results if the Meselson and Stahl experiment were carried out for four or five generations
B. What would be the expected results of the Meselson and Stahl experiment after three generations if the mechanism of DNA replication was dispersive
C. As shown in The Data, explain why three different bands (i.e., light, half-heavy, and heavy) can be observed in the CsCl gradient.
FIGURE 11.3 Evidence that DNA replication is semiconservative. Starting material: A strain of E. coli that has been grown for many generations in the presence of 15 N. All of the nitrogen in the DNA is labeled with 15 N.