Brock Biology of Microorganisms (15th Edition)
15th Edition
ISBN: 9780134261928
Author: Michael T. Madigan, Kelly S. Bender, Daniel H. Buckley, W. Matthew Sattley, David A. Stahl
Publisher: PEARSON
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Textbook Question
Chapter 11.5, Problem 1MQ
- Which protein, found in virtually all cells, facilitates the pairing required for homologous recombination?
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Two strains of S. cerevisae (yeast) are crossed. One has the genotype A B and the other a b. Which statement correctly describes the tetrads that can be produced by one reciprocal exchange between the A and B genes without gene conversion in the dihybrid?
A) Recombination occurs at the four-strand stage to produce a tetrad with A B, A B, a B, and a b chromosomes. B) Recombination occurs at the four-strand stage to produce a tetrad with A B, A b, a B, and a b chromosomes. C) Recombination occurs at the two-strand stage to produce a tetrad with A B, A b, a B, and a b chromosomes. D) Recombination occurs at the two-strand stage to produce a tetrad with A b, A b, a B, and a B chromosomes.
a) Are the genes linked? Please explain SPECIFICALLY how you can distinguish between linked and unlinked genes in this instance.
b) If the two genes are linked, calculate the % recombination between ser and thr. Show the formula used, as well as all of your calculations.
c) Draw a single map illustrating the arrangement of the two genes on the chromosome with respect to each other and to the centromere of the chromosome. Make sure to map ALL three distances.
A chromosome of genotype C D recombines with a homolog of genotype c d during meiosis when Spo11 produces a double-strand break between genes C and D. If anticrossover helicase disentangles the invading strand, the likely outcome would be
A) two C D and two c d gametes. B) two C d and two c D gametes. C) one C D, one C d, one c D, and one c d gamete. D) four C D gametes. E) four c d gametes
Chapter 11 Solutions
Brock Biology of Microorganisms (15th Edition)
Ch. 11.1 - Distinguish between a mutation and a mutant.Ch. 11.1 - Distinguish between screening and selection.Ch. 11.1 - Prob. 3MQCh. 11.1 - Write a one-sentence definition of the term...Ch. 11.2 - Do missense mutations occur in genes encoding...Ch. 11.2 - Why do frameshift mutations generally have more...Ch. 11.2 - Prob. 1CRCh. 11.3 - Why are suppressor tRNA mutations not lethal?Ch. 11.3 - Which class of mutation, missense or nonsense, is...Ch. 11.3 - What is the difference between same-site and...
Ch. 11.4 - Prob. 1MQCh. 11.4 - Prob. 2MQCh. 11.4 - Prob. 1CRCh. 11.5 - Which protein, found in virtually all cells,...Ch. 11.5 - Explain the fate of transferred chromosomal DNA if...Ch. 11.5 - Prob. 3MQCh. 11.5 - What are heteroduplex regions of DNA and what...Ch. 11.6 - During transformation a cell usually incorporates...Ch. 11.6 - In genetic transformation, what is meant by the...Ch. 11.6 - QExplain why recipient cells do not successfully...Ch. 11.7 - Prob. 1MQCh. 11.7 - What is the major difference between generalized...Ch. 11.7 - Why is phage conversion considered beneficial to...Ch. 11.7 - QExplain how a generalized transducing particle...Ch. 11.8 - In conjugation, how are donor and recipient cells...Ch. 11.8 - Explain how rolling circle DNA replication allows...Ch. 11.8 - QWhat is a sex pilus and which cell type, F or F+,...Ch. 11.9 - In conjugation involving the F plasmid of...Ch. 11.9 - Prob. 2MQCh. 11.9 - Prob. 3MQCh. 11.9 - QWhat is a merodiploid and how does an F plasmid...Ch. 11.10 - Why is it usually more difficult to select...Ch. 11.10 - Why do penicillins not kill species of Archaea?Ch. 11.10 - Explain one type of conjugation in Archaea and how...Ch. 11.11 - Prob. 1MQCh. 11.11 - What is the significance of the terminal inverted...Ch. 11.11 - How can transposons be used in bacterial genetics?Ch. 11.11 - Prob. 1CRCh. 11.12 - Why is the CRISPR system considered a prokaryotic...Ch. 11.12 - Prob. 2MQCh. 11.12 - QExplain why incoming DNA recognized by a short...Ch. 11 - A constitutive mutant is a strain that...Ch. 11 - Although a large number of mutagenic chemicals are...Ch. 11 - Why is it difficult in a single experiment to...Ch. 11 - Prob. 4AQ
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- An individual is heterozygous for a reciprocal translocation, with the following chromosomes: A • B C D E F A • B C V W X R ST • U D E F R ST • U V W X Q. Draw the products of alternate, adjacent-1, and adjacent-2 segregations.arrow_forwardTwo loci exhibit 5% recombination between them. How many map units apart are they?arrow_forwardWhat is nonhomologous recombination?arrow_forward
- A reciprocal translocation occurs in an individual between chromosomes 4 and 18, and this translocation causes a disease in the individual. What is the most likely reason chromosome mutation causes a disease? a) The translocation causes a break in the chromosome in a gene regulatory region. b) Chromosomes with a translocation cannot replicate. c) An individual with a translocation has some genes duplicated. d) An individual with a translocation has some genes missing.arrow_forwardAn individual is heterozygous for a reciprocal translocation, with the following chromosomes: A • B C D E F A • B C V W X R ST • U D E F R ST • U V W X Q. Explain why the fertility of this individual is likely to be less than the fertility of an individual without a translocation.arrow_forwardThe amount of crossing over is primarily determine by the a) length of the linked genes b) size of the linkage group c) size of the centromeres d) distance between the linked genes e) length of the chromosomearrow_forward
- what are recombination nodules?arrow_forwardAlleles of genes A and B were analyzed in Neurospora according to the cross shown below. Ordered tetrads are summarized in each horizontal row with the number of tetrads in each category listed alongside. A) Analyze the data to determine the recombination frequency (RF) between A and B, along with any additional information that is available from this data. B) Draw a map of the chromosome or chromosomes with appropriate map distances. C) Use the Perkins formula to reanalyze any relationship between A and B.arrow_forwardAn Hfrstrain that is a *b*c*d* e*f* g *h* is mated with an F strain that is a b e d e f gh. The mating is interrupted at 5 minutes interval, and the genotypes of the F recombinants are determined. The results obtained are tabulated in Table 2. Draw the map of the Hfrchromosome and indicate the position of the origin of transfer, the direction of the transfer and the minutes between genes. Table 2:Entry time of Hfr chromosome into recipient cell. Time a d e f h 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +arrow_forward
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genetic recombination strategies of bacteria CONJUGATION, TRANSDUCTION AND TRANSFORMATION; Author: Scientist Cindy;https://www.youtube.com/watch?v=_Va8FZJEl9A;License: Standard youtube license