Essentials of Genetics (9th Edition) - Standalone book
9th Edition
ISBN: 9780134047799
Author: William S. Klug, Michael R. Cummings, Charlotte A. Spencer, Michael A. Palladino
Publisher: PEARSON
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Chapter 8, Problem 5PDQ
List all of the differences between F+
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A donor strain of bacteria with genotype leu+ gal− pro+ is infected with phages. The phage lysate from the bacterial cells is collected and used to infect a second strain of bacteria that are leu− gal+ pro−. The second strain is selected for leu+, and the following cotransduction data are obtained: Donor Recipient Selected allele Cells with cotransduced allele (%) leu+ gal− pro+ leu− gal+ pro− leu+ 47 pro+ leu+ 26 gal− Which genes are closest, leu and gal or leu and pro?
DNA from a strain of Bacillus subtilis with genotype a+ b+ c+ d+ e+ is used to transform a strain with genotype a− b− c− d− e−. Pairs of genes are checked for cotransformation, and the following results are obtained: Pair of genes Cotransformation Pair of genes Cotransformation a+ and b+ No b+ and d+ No a+ and c+ No b+ and e+ Yes a+ and d+ Yes c+ and d+ No a+ and e+ Yes c+ and e+ Yes b+ and c+ Yes d+ and e+ No On the basis of these results, what is the order of the genes on the bacterial chromosome?
An Hfr strain that is leuA+ and thiL+ was mixed with a strain thatis leuA− and thiL−. In the data points shown in the following graph,the conjugation was interrupted at different time points, and thepercentage of recombinants for each gene was determined bystreaking on a medium that lacked either leucine or thiamine.What is the map distance (in minutes) between these two genes?
Chapter 8 Solutions
Essentials of Genetics (9th Edition) - Standalone book
Ch. 8 -
CASE STUDY | To treat or not to treat
A...Ch. 8 - CASE STUDY | To treat or not to treat A...Ch. 8 - Prob. 3CSCh. 8 - Prob. 4CSCh. 8 - HOW DO WE KNOW? In this chapter, we have focused...Ch. 8 -
CONCEPT QUESTION
2. Review the Chapter Concepts...Ch. 8 -
3. Distinguish among the three modes of...Ch. 8 - With respect to F+ and F- bacterial matings, (a)...Ch. 8 - List all of the differences between F+ × F– and...Ch. 8 - Describe the basis for chromosome mapping in the...
Ch. 8 - Why are the recombinants produced from an Hfr × F–...Ch. 8 - Describe the origin of F' bacteria and...Ch. 8 -
9. Describe the mechanism of transformation.
Ch. 8 - .
10. The bacteriophage genome consists primarily...Ch. 8 - Prob. 11PDQCh. 8 - In the plaque assay, what is the precise origin of...Ch. 8 -
13. In the plaque assay, exactly what makes up a...Ch. 8 - A plaque assay is performed beginning with 1.0 mL...Ch. 8 -
15. Describe the difference between the lytic...Ch. 8 - Prob. 16PDQCh. 8 -
17. Explain the observations that led Zinder and...Ch. 8 -
18. Describe the execution of and rationale...Ch. 8 - If a single bacteriophage infects one E. coli cell...Ch. 8 - A phage-infected bacterial culture was subjected...
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- Which of the following statements about conjugation is false? After a F- cell has conjugated with an F+ cell, both cells would be F+. Both Hfr and F+ bacteria have the ability to produce a sex pilus. In F+ × F- conjugation, none of the bacterial chromosome is transferred; only the F factor is. A Hfr strain usually transfers the entire bacterial chromosome to the recipient cell. F' × F- conjugation can produce a partially diploid bacterial cell.arrow_forwardIn five Hfr strains, each of which was used to build a time-of-transfer map, the genes entered the recipient cells as follows: Strain 1: S L A C T F Strain 2: N P F T C A Strain 3: T F P N U Y Strain 4: S H Y U N P Strain 5: U N P F T C Which of the following represents a correct gene map of these results? N P F T S L A C H U Y S L A C T F P N H Y U C T F P N U Y H S L A T C A L S P N U Y H F U N P C A L S F T H Yarrow_forwardDNA obtalned from the indicated donor strains is used to TRANSFORM the indicated recipient strains. The resulting progeny are plated on minimal medium so that only wild- type recombinants are scored. The number of wild-types for each cross is given in the chart below. What is the order of the genes? Donor Recipient wid type colonies a-b- c+ a+ b+ c- 273 a- b+ c- a+ b-c+ 462 a- b+ C+ a+ b-c- 2 a b- C+ a- b+ c+ O 4-b-c a-o-b b-a-c cannot be determined Question 18 of 26arrow_forward
- Why are the recombinants produced from an Hfr * F- cross rarely, if ever, F+?arrow_forwardA donor strain of bacteria with genotype leu* gal pro* is infected with phages. The phage lysate from the bacterial cells is collected and used to infect a second strain of bacteria that are leu gal* pro". The second strain is selected for leu", and the following cotransduction data are obtained: Cells with cotransduced allele (%) Selected Donor Recipient allele leu* leu" gal* leu* 47 pro* gal" pro* pro leu* 26 gal" Which genes are closest, leu and gal or leu and pro?arrow_forwardThree different Hfr donor strains are mixed with separate samples of an F strain, and the following mapping data are provided from studies of interrupted conjugation: Appearance of genes in F cells Hfr1: Genes b* d* c* f* g* Time* 3 16 27 59 Hfr2: Genes e* f* c* d* b+ Time 6 24 35 46 48 Hfr3: Genes d* c* f* e+ g* Time 4 15 26 44 58 Construct a genetic map for these genes, indicating their order on the bacterial chromosome and the distances between them.arrow_forward
- A bacterial strain with genotype his− leu− thr− is transformed with DNA from a strain that is his+ leu+ thr+. A few leu+ thr+ cells and a few his+ thr+ cells are found, but no his+ leu+ cells are observed. Which genes are farthest apart?arrow_forwardA bacterium of genotype a+ b+ c+ d+ is the donor in a cotransformation mapping. The recipient is a-b-c-d-. Data from the transformed cells is shown below. What is the order of the genes? a+ and b+ 5 a+ and c+ 2 a+ and d+ 0 b+ and c+ 0 b+ and d+ 0 c+ and d+ 5 cbad cadb bcda acbd bacdarrow_forwardA bacterium of genotype a+b+c+d+ is the donor in a cotransformation mapping. The recipient is a–b–c–d–. Data from the transformed cells are shown below. What is the order of the genes? a+ and b+ 2 a+ and c+ 0 a+ and d+ 5 b+ and c+ 5 b+ and d+ 0 c+ and d+ 0arrow_forward
- E. coli cells are simultaneously infected with two strains of phage λ. One strain has a mutant host range, is temperature sensitive, and produces clear plaques (genotype h st c); another strain carries the wildtype alleles (genotype h+ st+ c+). Progeny phages are collected from the lysed cells and are plated on bacteria. The following numbers of different progeny phages are obtained: Progeny phage genotype Number of plaques h+ c+ st+ 321 h c st 338 h+ c st 26 h c+ st+ 30 h+ c st+ 106 h c+ st 110 h+ c+ st 5 h c st+ 6 a. Determine the order of the three genes on the phage chromosome. b. Determine the map distances between the genes. c. Determine the coefficient of coincidence and the interferencearrow_forwardList the major differences between (i) the F* xF and the Hfr x F bacterial crosses (ii) the F*, F, Hfr and F' bacteriaarrow_forwardDNA from a strain of Bacillus subtilis with genotype a* b* c* d* e* is used to transform a strain with genotype a b c d e. Pairs of genes are checked for cotransformation, and the following results are obtained: Pair of genes Cotransformation Pair of genes Cotransformatic a* and b* No b* and d* No a* and c* No b* and e* Yes a* and d* Yes c* and d* No a* and e* Yes c* and e* Yes b* and c* Yes d* and e* No On the basis of these results, what is the order of the genes on the bacterial chromosome?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