Genetics: Analysis and Principles
6th Edition
ISBN: 9781259616020
Author: Robert J. Brooker Professor Dr.
Publisher: McGraw-Hill Education
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Chapter 19, Problem 34CONQ
With regard to the repair of double-strand breaks, what are the advantages and disadvantages of homologous recombination repair versus nonhomologous end joining?
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With regard to the repair of double-strand breaks, what are the advantages and disadvantages of homologous recombination repair (HRR) versus nonhomologous end joining (NHEJ)?
Two pathways, homologous recombination and nonhomologous end joining (NHEJ), can repair double-strandbreaks in DNA. If homologous recombination is an errorfree pathway whereas NHEJ is not always error free, whyis NHEJ used most of the time in eukaryotes?
In each of the illustrations below, a segment of a chromosome has two copies of a transposable element. In panel a, they are oriented in the same direction, whereas in panel b they are in opposite directions.
A double strand break occurs in element A and is repaired by homologous recombination using element B as a repair template. For each case, what will the chromosome look like after homologous recombination occurs? Choose one of the five options below, 1-5.
Chapter 19 Solutions
Genetics: Analysis and Principles
Ch. 19.1 - 1. A mutation changes a codon that specifies...Ch. 19.1 - A down promoter mutation causes the promoter of a...Ch. 19.1 - 3. A mutation in one gene that reverses the...Ch. 19.1 - Which of the following is an example of a somatic...Ch. 19.2 - Prob. 1COMQCh. 19.3 - Which of the following is not an example of a...Ch. 19.3 - A point mutation could be caused by a....Ch. 19.3 - One way that TNRE may occur involves the formation...Ch. 19.4 - Nitrous acid replaces amino groups with keto...Ch. 19.4 - Prob. 2COMQ
Ch. 19.4 - Prob. 3COMQCh. 19.5 - The function of photolyase is to repair a....Ch. 19.5 - Which of the following DNA repair systems may...Ch. 19.5 - 3. In nucleotide excision repair in E. coli, the...Ch. 19.5 - Prob. 4COMQCh. 19.5 - An advantage of translesion-replicating...Ch. 19 - Is each of the following mutations a transition,...Ch. 19 - Prob. 2CONQCh. 19 - What does a suppressor mutation suppress? What is...Ch. 19 - Prob. 4CONQCh. 19 - X-rays strike a chromosome in a living cell and...Ch. 19 - Prob. 6CONQCh. 19 - Prob. 7CONQCh. 19 - 8. A point mutation occurs in the middle of the...Ch. 19 - Prob. 9CONQCh. 19 - Prob. 10CONQCh. 19 - 11. Is a random mutation more likely to be...Ch. 19 - 12. Which of the following mutations could be...Ch. 19 - Prob. 13CONQCh. 19 - Discuss the consequences of a germ-line versus a...Ch. 19 - Prob. 15CONQCh. 19 - Explain how a mutagen can interfere with DNA...Ch. 19 - What type of mutation (transition, transversion,...Ch. 19 - Explain what happens to the sequence of DNA during...Ch. 19 - Distinguish between spontaneous and induced...Ch. 19 - Prob. 20CONQCh. 19 - Prob. 21CONQCh. 19 - Prob. 22CONQCh. 19 - Trinucleotide repeat expansions (TNREs) are...Ch. 19 - 24. With regard to TNRE, what is meant by the term...Ch. 19 - 25. What is the difference between the mutation...Ch. 19 - Achondroplasia is a rare form of dwarfism. It is...Ch. 19 - Prob. 27CONQCh. 19 - In the treatment of cancer, the basis for many...Ch. 19 - Prob. 29CONQCh. 19 - 30. Which of the following examples is likely to...Ch. 19 - Prob. 31CONQCh. 19 - Prob. 32CONQCh. 19 - Prob. 33CONQCh. 19 - With regard to the repair of double-strand breaks,...Ch. 19 - Prob. 35CONQCh. 19 - Prob. 36CONQCh. 19 - 37. Three common ways to repair changes in DNA...Ch. 19 - Prob. 38CONQCh. 19 - Prob. 39CONQCh. 19 - Explain how the technique of replica plating...Ch. 19 - 2. Outline how you would use the technique of...Ch. 19 - 3. From an experimental point of view, is it...Ch. 19 - Prob. 4EQCh. 19 - Prob. 5EQCh. 19 - 6. Richard Boyce and Paul Howard-Flanders...Ch. 19 - In E. coli, a variety of mutator strains have been...Ch. 19 - 2. Discuss the times in a person’s life when it is...Ch. 19 - A large amount of research is aimed at studying...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Eukaryotic cells can repair DNA through a process called homologous recombination. What type of DNA damage can be fixed through homologous recombination?arrow_forwardHomologous recombination in E. coli forms heteroduplex regions of DNA containing mismatched bases. Why are these mismatches not eliminated by the mismatch repair system?arrow_forwardWhat is meant by the term semiconservativereplication? What are the functions of DNA Pol I and III,helicase, and primase? How does a leading strand differfrom a lagging strand?arrow_forward
- In some organisms, UV-induced thymine dimers can be repaired by photoreactivation, in which energy from visible light is used to split the bonds forming the cyclobutane ring ? true or false Non-homologous end joining occurs when enzymes cut out a few nucleotides around a double strand DNA break, and then fuse the ends back together (right) true or false?arrow_forwardWhat are the steps of Homologous recombination during DNA repair?arrow_forwardIn the Meselson-Stahl experiment on DNA replication, what fraction of the DNA was composed of one light strand and one heavy strand ("hybrid") after one generation of growth in medium containing 14N? After two generations of growth in a medium containing 14N? What fraction of hybrid DNA is expected after n generations of growth in a medium containing 14N?arrow_forward
- According to the double-strand break model, does gene conversionnecessarily involve DNA mismatch repair? Explain.arrow_forwardSupercoiled DNA is slightly unwound compared to relaxed DNA and this enables it to assume a more compact structure with enhanced physical stability. Describe the enzymes that control the number of supercoils present in the E. coli chromosome. How much would you have to reduce the linking number to increase the number of supercoils by five?arrow_forwardExplain why a DSB-repair homologous recombination can occur between any two DNA molecules that share homology rather than only between two DNA molecules that carry a specific sequence.arrow_forward
- Homologous recombination in E. coli forms heteroduplex regions of DNA containing mismatched bases. Why are these mismatches not eliminated bythe mismatch repair system?arrow_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 the scenario where a single strand break occurs in the DNA replication fork: a) What would happen if RecC failed to bind to the chi site? Explain briefly and draw out the step at which recombinational DNA repair would stall. b) What would happen if RecA failed to bind DNA? Explain briefly and draw out the step at which recombinational DNA repair would stall. c) Draw the resolved product of this Holliday junction if it's cleaved in the direction of the white triangles. Is the result a heteroplex or recombinant? A Strand Invasion Ⓒ Holliday Junction A Resolvearrow_forward
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