Concepts of Genetics (12th Edition)
Concepts of Genetics (12th Edition)
12th Edition
ISBN: 9780134604718
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino, Darrell Killian
Publisher: PEARSON
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Chapter 18, Problem 11PDQ

In 1998, future Nobel laureates Andrew Fire and Craig Mello, and colleagues, published an article in Nature entitled, “Potent and Specific Genetic Interference by Double-Stranded RNA in Caenorhabditis elegans.” Explain how RNAi is both “potent and specific.”

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Dosage compensation is critical for organisms with sex chromosomes to equilibrate gene expression. The role of long non-coding RNAs has been shown to play an important role in affecting the decision to carry out X chromosome inactivation during dosage compensation in mammals. Q9a) How can a long non-coding RNA affect the decision to keep an X-chromosome active in female mammals?  Q9b) How can a long non-coding RNA initiate the steps to silence the chromosome to be inactivated?  Q9c) Explain which long non-coding RNA is responsible for the various steps to silence the inactive X and describe how its function leads to changes in the chromatin that are incompatible with active transcription off the inactive X
Describe experimental evidence that would indicate that most or nearly all of the DNA sequences in a mammalian genome are transcribed.
Give typing answer with explanation and conclusion    a) List three eukaryotic gene expression mechanisms that do not occur in prokaryotes. For two of these, give specific examples and the functional outcomes.   b) Describe what is meant by the term “RNA silencing”.   c) Using diagrams, give two examples of RNA silencing mechanisms and indicate one difference.

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Concepts of Genetics (12th Edition)

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