iGenetics 3rd Edition by Peter Russell

Exercise 2

In the Meselson-Stahl experiment, 15 N-labeled cells were shifted to a 14 N medium at what we can designate as generation 0.
a. For the semiconservative model of replication, what proportion of 15 N- 15 N, 15 N- 14 N, and 14 N- 14 N DNA would you expect to find after one, two, three, four, six, and eight replication cycles?
b. Answer (a) in terms of the conservative model of DNA replication.