In semiconservative replication, when the double stranded DNA helix is replicated, each of the two new double-stranded DNA helices consisted of one strand from the original helix and one newly synthesized. Mix with cesium chloride and separate heavy and light DNA. All contents copyright © 1996. Conclusion- as predicted by Watson and Crick, DNA strands serve as After a second generation, one half of the new daughter strands are light (using. Keywords: molecular biology, problem-based learning, DNA replication. Meselson and Stahl … Meselson and Stahl in 1957 gave experimental evidence that each DNA strand served as a template for new synthesis, a process called semi-conservative replication. Results show that after one generation, the double stranded DNA is templates for their own replication. The Meselson–Stahl experiment is an experiment by Matthew Meselson and Franklin Stahl in 1958 which supported Watson and Crick's hypothesis that DNA replication was semiconservative. intermediate density. All rights reserved. Problem 6: Meselson-Stahl DNA replication experiment In the Meselson-Stahl DNA replication experiment, if the cells were first grown for many generations in 15N containing media, and then switched to 14N containing media, what percent of the DNA had 1 light strand and 1 heavy strand after 2 generations of growth 1/2 heavy (from the parent) and 1/2 light (newly synthesized). THE EXPERIMENT The experiment described in this test was performed by Matthew Meselson and Frank Stahl to study the mechanism of DNA replication in Escherichia coli cells [1]. This means that 100% of the strands are of It has been called "the most beautiful experiment in biology." It is regarded as a milestone of early molecular biol-ogy, considered by some ‘‘the most beautiful experi-