EBK ESSENTIALS OF PATHOPHYSIOLOGY
4th Edition
ISBN: 9781469893389
Author: PORTH
Publisher: WOLTERS KLUWER HEALTH (COURSE)
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Question
Chapter 17, Problem 1RE
Summary Introduction
To determine: The Poiseuille law to explain the symptoms of myocardial ischemia that do not usually occur until the vessel has been 75% occluded.
Introduction: The myocardial ischemia is caused due to blockage in the coronary artery that prevents the oxygen from reaching the muscles. The heart is unable to pump the blood, and the flow of blood is also reduced.
Expert Solution & Answer
Explanation of Solution
The Poiseuille law depicts that the change in pressure, viscosity, and length of the tube directly affects the flow in any vessel. The flow of blood is inversely proportional to the resistance in the system. The flow of blood is restricted because of the resistance caused due to cholesterol deposited in the coronary artery.
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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 17 Solutions
EBK ESSENTIALS OF PATHOPHYSIOLOGY
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