Genetic Analysis: An Integrated Approach (3rd Edition)
3rd Edition
ISBN: 9780134605173
Author: Mark F. Sanders, John L. Bowman
Publisher: PEARSON
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Chapter 13, Problem 10P
The term heterochromatin refers to heavily condensed regions of chromosomes that are largely devoid of genes. Since few genes exist in those regions, they almost never decondense for transcription. At what point during the cell cycle would you expect to observe the decondensation of heterochromatic regions? Why?
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The term heterochromatin refers to heavily condensed regions of chromosomes that are largely devoid of genes. Since few genes exist there, these regions almost never decondense for transcription. At what point during the cell cycle would expect to observe decondensation of heterochromatic regions? Why?
What is the relation between the concepts of chromatin andchromosome? Are euchromatin and heterochromatin part of chromosomes?
In eukaryotes which of the following combination of chromatin conditions would be most likely to result in the highest levels of expression of gene?
Chapter 13 Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Ch. 13 - 13.1 Devoting a few sentences to each, describes...Ch. 13 - 13.2 Describe and give an example (real or...Ch. 13 - What is meant by the term chromatin remodeling?...Ch. 13 - 13.4 What general role does acetylation of histone...Ch. 13 - 13.5 Describe the roles of writers, readers, and...Ch. 13 - Outline the roles of RNA in eukaryotic gene...Ch. 13 - 13.7 What are the roles of the Polycomb and...Ch. 13 - Most biologists argue that the regulation of gene...Ch. 13 - Compare and contrast the transcriptional...Ch. 13 - The term heterochromatin refers to heavily...
Ch. 13 - 13.11 Compare and contrast promoters and enhancers...Ch. 13 - 13.12 What are the different chromatin...Ch. 13 - 13.13 Define epigenetics, and provide examples...Ch. 13 - What is one proposed role for lncRNAs?Ch. 13 - 13.15 What are the sources of dsRNA? Diagram the...Ch. 13 - How does dsRNA lead to posttranscriptional gene...Ch. 13 - 13.17 A hereditary disease is inherited as an...Ch. 13 - Prob. 18PCh. 13 - Prob. 19PCh. 13 - 13.20 A muscle enzyme called ME is produced by...Ch. 13 - Using the components in the accompanying diagram,...Ch. 13 - 13.22 The majority of this chapter focused on gene...
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- Which of the following statements is NOT true about chromatin architecture? A. The histone tails on heterochromatin are deacetylated B. Heterochromatin is heavily methylated C. Euchromatin is more likely to contain genes that are expressed at that time D. Euchromatin is heavily methylatedarrow_forwardAn article entitled “Nucleosome Positioning at the Replication Fork” states: “both the ‘old’ randomly segregated nucleosomes as well as the ‘new’ assembled histone octamers rapidly position themselves (within seconds) on the newly replicated DNA strands” [Lucchini et al. (2002)]. Given this statement, how would one compare the distribution of nucleosomes and DNA in newly replicated chromatin? How could one experimentally test the distribution of nucleosomes on newly replicated chromosomes?arrow_forwardIn which phases of the cell cycle would you expect double-strand break repair and nonhomologous end joining to occur and why?arrow_forward
- What is the purpose of heterochromatin and does heterochromatin transcribed?arrow_forwardAn old genetic observation is that a normally active gene will be silenced if it is moved by transposition or crossing over from an uncondensed (euchromatic) region to a heavily condensed (heterochromatic) region of a chromosome. Assume the euchromatic chromatin containing the active gene is surrounded by heterochromatic chromatin immediately after insertion. Please explain in terms of the control of histone modification why the normally active gene is silenced when it becomes surrounded by condensed regions. (Do not explain how histone modification causes chromatin condensation.)arrow_forwardWhat is chromatin condensation?arrow_forward
- Define the following terms: a. chromosome b. chromatinarrow_forwardExplain, How does histone acetylation alter chromatin structure?arrow_forwardWhich of the following statements most accurately represent chromatin state and transcription? Group of answer choices 1.Histone deacetylases promote closed chromatin and result in repressed transcription 2.Open chromatin is associated with hypoacetylation and has high levels of transcription 3.Histone acetyltransferases result in hypoacetylation and high levels of transcription 4.Hyperacetylation is associated with closed chromatin and low levels of transcriptionarrow_forward
- Why Most Genes in HeterochromatinRegions Are Silenced?arrow_forwardWhy Heterochromatin spreads linearly?arrow_forwardThe data below are from a DNAse-Seq experiment of chromosome 22. DNAse-seq is another method for measuring chromatin organization. In the experiment, regions of chromatin are digested with DNAse I and DNA is sequenced to determined to identify cleavage sites. See this short article for complete explanation. Which of the following statements are true based on the data below (select all that apply)? A. Region C appears to be an actively transcribed region in all tissue types except trophoblasts B. Region A could be an origin of replication for the chromosome C. Region B is highly associated with nucleosomes in BE2C and Natural KIller Cells D. The genes in the fetal kidney tissue are the least actively transcribed on chromosome 22. E. The data for each tissue must be from separate people to have such a variation in DNAse sensitivityarrow_forward
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