Nester's Microbiology: A Human Perspective
9th Edition
ISBN: 9781259709999
Author: Denise G. Anderson Lecturer, Sarah Salm, Deborah Allen
Publisher: McGraw-Hill Education
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Chapter 25, Problem 1A
Some years ago, dentists and doctors began noticing an association between infective endocarditis and prior dental work, and they began advising that an antibiotic be administered at the time of dental procedures to those with known or suspected heart defects. What was the rationale for this advice and why has the practice been discontinued for many people?
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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 25 Solutions
Nester's Microbiology: A Human Perspective
Ch. 25 - Prob. 1SACh. 25 - Prob. 2SACh. 25 -
3. What activities of humans are likely to expose...Ch. 25 - Prob. 4SACh. 25 -
5. Why might the Yersinia pestis from a patient...Ch. 25 -
6. Why might rodent burrows be a source of plague...Ch. 25 - Prob. 7SACh. 25 - Prob. 8SACh. 25 - Prob. 9SACh. 25 -
10. Which Plasmodium species causes the most...
Ch. 25 - Which of the following infection fighters are...Ch. 25 - Which of the following statements about the spleen...Ch. 25 - Prob. 3MCCh. 25 - Prob. 4MCCh. 25 - Prob. 5MCCh. 25 - Prob. 6MCCh. 25 - Which statement about Yersinia pestis is false? a)...Ch. 25 - Prob. 8MCCh. 25 - Prob. 9MCCh. 25 - Prob. 10MCCh. 25 - Some years ago, dentists and doctors began...Ch. 25 - Prob. 2ACh. 25 -
1. At least four emerging mosquito-borne diseases...Ch. 25 -
2. Even though genetically engineered mosquitoes...
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