Prescott's Microbiology
11th Edition
ISBN: 9781260211887
Author: WILLEY, Sandman, Wood
Publisher: McGraw Hill
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Chapter 35, Problem 5AL
Summary Introduction
The Staphylococcus aureus Panton-Valentine leucocidin (PVL) is characterized by a pore-forming toxin, which is secreted by strains that are epidemiologically accompanying with the outburst of community-associated methicillin-resistant Staphylococcus aureus (CA-MRSA) and also with lethal necrotizing pneumonia. To test the function of PVL pulmonary disease, the pathogenicity of clinical samples, purified PVL, isogenic PVL-positive and PVL-negative S. aureus strains have been tested.
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Three of the many recessive mutations in Drosophila melanogaster that affect body color, wing shape, or bristle morphology are black (b) body versus grey in wild type, dumpy (dp), obliquely truncated wings versus long wings in the male, and hooked (hk) bristles versus not hooked in the wild type. From a cross of a dumpy female with a black and hooked male, all of the F1 were wild type for all three of the characters. The testcross of an F1 female with a dumpy, black, hooked male gave the following results:
Trait
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169
Black
19
Black, hooked
301
Dumpy, hooked
21
Hooked, dumpy, black
172
Dumpy, black
6
Dumpy
305
Hooked
8
Determine the order of the genes and the mapping distance between genes.
Determine the coefficient of confidence for the portion of the chromosome involved in the cross. How much interference takes place in the cross?
What happens to a microbes membrane at colder temperature?
Genes at loci f, m, and w are linked, but their order is unknown. The F1 heterozygotes from a cross of FFMMWW x ffmmww are test crossed. The most frequent phenotypes in the test cross progeny will be FMW and fmw regardless of what the gene order turns out to be.
What classes of testcross progeny (phenotypes) would be least frequent if locus m is in the middle?
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Chapter 35 Solutions
Prescott's Microbiology
Ch. 35.1 - MICRO INQUIRY During which stages does the host...Ch. 35.1 - Define infection, infectious disease,...Ch. 35.1 - Prob. 2CCCh. 35.1 - What are some important characteristics of a...Ch. 35.1 - What is an obligate intracellular pathogen? How...Ch. 35.1 - Prob. 5CCCh. 35.1 - Prob. 6CCCh. 35.2 - Prob. 1CCCh. 35.2 - Prob. 2CCCh. 35.2 - Define droplet nuclei, vehicle, fomite, and...
Ch. 35.2 - Prob. 4CCCh. 35.2 - Prob. 5CCCh. 35.2 - Prob. 6CCCh. 35.3 - Prob. 1CCCh. 35.3 - Prob. 2CCCh. 35.3 - Prob. 3CCCh. 35.3 - Prob. 4CCCh. 35.4 - What are virulence factors?Ch. 35.4 - What are pathogenicity islands and why are they...Ch. 35.4 - Prob. 3CCCh. 35.4 - Prob. 4CCCh. 35 - Prob. 1RCCh. 35 - Prob. 2RCCh. 35 - Prob. 3RCCh. 35 - Prob. 1ALCh. 35 - Prob. 2ALCh. 35 - Prob. 3ALCh. 35 - Prob. 4ALCh. 35 - Prob. 5ALCh. 35 - Prob. 6AL
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