Biological Science
Biological Science
5th Edition
ISBN: 9780321743671
Author: Scott Freeman
Publisher: PEARSON
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Chapter 15, Problem 14TYPSS

MODEL In the late 1950s, Herbert Taylor grew bean root-tip cells in a solution of radioactive thymidine and allowed them to undergo one round of DNA replication. He then transferred the cells to a solution without the radioactive deoxyribonucleotide, allowed them to replicate again, and examined their chromosomes for the presence of radioactivity. His results are shown in the following figure, where red indicates a radioactive chromatid.

Chapter 15, Problem 14TYPSS, 9. MODEL In the late 1950s, Herbert Taylor grew bean root-tip cells in a solution of radioactive

a. Draw labeled diagrams of double-stranded DNA molecules that explain the pattern of radioactivity observed in the sister chromatids after the first and second rounds of replication.

b. What would the results of Taylor's experiment be if eukaryotes used a conservative mode of DNA replication?

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