ETEXT CAMPBELL BIOLOGY IN FOCUS INSTANT
ETEXT CAMPBELL BIOLOGY IN FOCUS INSTANT
3rd Edition
ISBN: 9780135964422
Author: Urry
Publisher: PEARSON
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Chapter 32.3, Problem 3CC
Summary Introduction

To determine:

The rate at which the body temperature will return to normal if out of desperation an individual have dunk his head into the cooler to get relief from heat.

Introduction:

In living organisms the metabolic property of a body is always maintained by the property of homeostasis. Thermoregulation is also a process of homeostasis that regulates the changes in the temperature of internal environment. Like, when the temperature of body rises, the body’s skin heat sensors detect this change and help in lowering the body temperature by the process of sweating. Sweating, then cools down the body.

The endotherms are the animals that maintain their internal body temperature by thermoregulation as sudden change in the body temperature could be fatal for an organism. Endotherms get heat from the internal metabolic activities if the outside temperature is low and cool down their bodies by process of sweating if the outside temperature is high.

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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:
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