Prescott's Microbiology
10th Edition
ISBN: 9781259281594
Author: Joanne Willey, Linda Sherwood Adjunt Professor Lecturer, Christopher J. Woolverton Professor
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 41, Problem 3CHI
Why were aflatoxins not discovered before the 1960s? Do you think this was the first time they had grown in a food product to cause disease?
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Question #3:
In the KeyGene paper, the authors state that it would be useful if pollen from an apomict would
transmit apomixis-inducing genes to the female in the cross (assuming the pollen is viable). Assuming
there was just one gene conferring gametophytic obligate apomixis, and that the two parents are
inbreds, what would be the consequences of such a cross if:
a) The apomixis was a dominant trait? Indicate the genotypes and phenotypes (apomict or non-
apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic
and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female
first (left side) in the parental cross.
b) The apomixis was a recessive trait? Indicate the genotypes and phenotypes (apomict or non-
apomict) of the parents, F1 and F2 generations. Remember to include the expected genotypic
and phenotypic ratios (or percentages) in the F1 and F2 generations, and to position the female
first (left side) in the…
Question #5:
Assume that two genes are identified that confer gametophytic facultative apomixis in soybean. The
genes show independent assortment. Recessive alleles at both loci are required for the facultative
apomixis. Facultative apomixis is triggered when the temperature at pollination is above 20 degrees C.
At temperatures below 20 degrees C, all reproduction is sexual, independent of genotype.
A facultative apomict male, capable of producing viable pollen, was crossed with a sexually
reproducing female. Assuming the parents are completely inbred, what are the predicted phenotypic
ratios (apomict: non-apomict) for the F1, F2, and DH (F1-derived) generations at each of the following
temperatures*:
a) 15°C?
b) 25°C?
*for full credit, show crosses and genotypes where appropriate. Remember to position the
female first (left side) in the cross.
Type your answer here:
Chapter 41 Solutions
Prescott's Microbiology
Ch. 41.1 - What are some intrinsic factors that influence...Ch. 41.1 - How would the spoilage of bread differ from that...Ch. 41.1 - Why do sausage and other ground meat products...Ch. 41.1 - What extrinsic factors can determine whether food...Ch. 41.2 - MICRO INQUIRY Canned products such as vegetable...Ch. 41.2 - Describe the major approaches used in food...Ch. 41.2 - What types of chemicals can be used to preserve...Ch. 41.2 - What cellular component does HHP target? What is...Ch. 41.2 - How does nisin function? What bacterial genus...Ch. 41.2 - Prob. 5RIA
Ch. 41.2 - What are the major gases involved in MAP? How are...Ch. 41.3 - MICRO INQUIRY What foods are most prone to...Ch. 41.3 - What is the difference between a food-borne...Ch. 41.3 - What practical recommendations regarding food...Ch. 41.3 - Prob. 3RIACh. 41.3 - Members of what microbial genus produce fumonisins...Ch. 41.4 - MICRO INQUIRY Why is it important that PulseNet...Ch. 41.4 - How are most food-borne pathogens detected?Ch. 41.4 - Why is it advantageous to omit the pre-enrichment...Ch. 41.4 - How is PulseNet used in the surveillance of...Ch. 41.4 - How are most food-borne pathogens detected?Ch. 41.5 - Can you name at least two features that make these...Ch. 41.5 - What are the major types of milk fermentations?Ch. 41.5 - What are the major types of milk fermentations?Ch. 41.5 - What major steps are used to produce cheese? How...Ch. 41.5 - Prob. 1.4RIACh. 41.5 - Describe and contrast the processes of wine and...Ch. 41.5 - How do champagnes differ from wines?Ch. 41.5 - Describe how distilled spirits such as whiskey are...Ch. 41.5 - What microorganisms are most important in...Ch. 41.6 - What bacterial genera are often included in...Ch. 41.6 - How are probiotics used in agriculture?Ch. 41 - Compare the sell-by date of a package of hot dogs...Ch. 41 - You are going through a salad line in a cafeteria...Ch. 41 - Why were aflatoxins not discovered before the...Ch. 41 - What advantage might the Shiga-like toxin give E....Ch. 41 - Keep a record of what you eat for a day or two....Ch. 41 - During cheese production, LAB convert lactose to...Ch. 41 - Following recent outbreaks of E. coli O157:H7...
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