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 6, Problem 24P
The phage P1 is used as a generalized transducing phage in an experiment combining a donor strain of E. coli of genotype leu+phe+ala+ and a recipient strain that is leu-phe-ala-. In separate experiments, transductants are selected for leu+ (experiment A), for phe+ (experiment B), and for ala+ (experiment C). Following selection, transductant genotypes for the unselected markers are identified.
a. What compound or compounds are added to the minimal medium to select for transductants in experiments A, B, and C?
b. Selection experiment results below show the frequency of each genotype.
c. Determine the order of genes on the donor chromosome.
d. Diagram the crossover events that form each of the transductants in experiment A.
e. In experiment B, why are there no transductants with the genotype leu- ala+?
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Students have asked these similar questions
Bacteriophage P22 was used in generalized transduction experiments to infect the Salmonella
typhimurium donor strains described in the table below. The resulting phage lysates were then
used to infect the S. typhimurium recipient strains listed in the table. In each cross, a
phenotype was selected for one of the three genetic markers studied (str, aceA, thrA), and then
replicates were performed to select the corresponding recombinants for the other two markers.
The results are given in the following table:
Recipient strain Selected phenotype Selected recombinants
Donor
strain
str thrA
aceA+ thrA
str aceA+
strs thrA+
aceA thrA+
str aceA
Str
Ace+
Str
ThrA
ThrA+
ThrA
ThrA+
Ace
Ace
str: gene involved in streptomycin resistance,
aceA gene involved in the use of acetate as a carbon source,
thrA: gene involved in the biosynthesis of threonine.
Number
60
40
95
5
10
90
Determine the order of the genes and draw a genetic map showing this order
In a generalized-transduction experiment, phages arecollected from an E. coli donor strain of genotype cys+leu+ thr+ and used to transduce a recipient of genotypecys- leu- thr-. Initially, the treated recipient populationis plated on a minimal medium supplemented with leucine and threonine. Many colonies are obtained.a. What are the possible genotypes of these colonies?b. These colonies are then replica plated onto threedifferent media: (1) minimal plus threonine only, (2)minimal plus leucine only, and (3) minimal. Whatgenotypes could, in theory, grow on these three media?c. Of the original colonies, 56 percent are observed togrow on medium 1, 5 percent on medium 2, and nocolonies on medium 3. What are the actual genotypes ofthe colonies on media 1, 2, and 3?d. Draw a map showing the order of the three genes andwhich of the two outer genes is closer to the middle gene
Austin Taylor and Edward Adelberg isolated some new strains of Hfr cells that they then used to map several genes in E. coli by using interrupted conjugation . In one experiment, they mixed cells of Hfr strain AB-312, which were xyl+ mtl+ mal+ met+ and sensitive to phage T6, with F− strain AB-531, which was xyl− mtl− mal− met− and resistant to phage T6. The cells were allowed to undergo conjugation. At regular intervals, the researchers removed a sample of cells and interrupted conjugation by killing the Hfr cells with phage T6. The F− cells, which were resistant to phage T6, survivedand were then tested for the presence of genes transferred from the Hfr strain. The results of this experiment are shown in the accompanying graph. On the basis of these data, give the order of the xyl, mtl, mal, and met genes on the bacterial chromosome and indicate the minimum distances between them.
Chapter 6 Solutions
Genetic Analysis: An Integrated Approach (3rd Edition)
Ch. 6 - For bacteria that are F+, Hfr, F', and F-, perform...Ch. 6 - The flow diagram identifies relationships between...Ch. 6 - Conjugation between an Hfr cell and an F-cell does...Ch. 6 - Bacteria transfer genes by conjugation,...Ch. 6 - Explain the importance of the following features...Ch. 6 - Prob. 6PCh. 6 - Describe what is meant by the term site-specific...Ch. 6 - What is a prophage, and how is a prophage formed?Ch. 6 - How is the frequency of cotransduction related to...Ch. 6 - Describe the differences between genetic...
Ch. 6 - Among the mechanisms of gene transfer in bacteria,...Ch. 6 - What is lateral gene transfer? How might it take...Ch. 6 - Lateral gene transfer is thought to have played a...Ch. 6 - Prob. 14PCh. 6 - A 2013 CDC report identified the practice of...Ch. 6 - Hfr strains that differ in integrated F factor...Ch. 6 - Five Hfr strains from the same bacterial species...Ch. 6 - An interrupted mating study is carried out on Hfr...Ch. 6 - An Hfr strain with the genotype cys+leu+met+strS...Ch. 6 - A triple-auxotrophic strain of E. coli having the...Ch. 6 - Penicillin was first used in the 1940 s to treat...Ch. 6 - An attribute of growth behavior of eight...Ch. 6 - Synthesis of the amino acid histidine is a...Ch. 6 - The phage P1 is used as a generalized transducing...Ch. 6 - Prob. 25PCh. 6 - Prob. 26PCh. 6 - Look closely at the consolidated Hfr map and the...Ch. 6 - Fifty bacterial colonies are on a complete-medium...
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