Connect with LearnSmart for Hoefnagels: Biology: The Essentials
Connect with LearnSmart for Hoefnagels: Biology: The Essentials
3rd Edition
ISBN: 9781260140712
Author: Marille Hoefnagels
Publisher: Mcgraw-hill Higher Education (us)
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Chapter 20, Problem 12WIO
Summary Introduction

To determine:

The reduction of global climate change by planting trees.

Introduction:

CO2 has been accumulating in the atmosphere due to the use of fossil fuels such as coal, oil, and gas. This has increased the average global temperature. The gradual warming of the earth has led to the melting of alpine glaciers and polar ice sheets. The loss of ice over land has contributed to a rise in sea level. The rise in sea surface temperature has changed the weather conditions in tropical and temperate regions. This has resulted in high rainfall in tropics and droughts in temperate areas.

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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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