Becker's World of the Cell (9th Edition)
Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 3, Problem 3.4PS

(a)

Summary Introduction

To determine: The effect of substitution of valine in the place of glutamate at the 6th position of β-chain.

Introduction: The condition where there’s an inadequate amount of red blood cells are present in the body is called “sickle cell anemia.” During the presence of an insufficient amount of red blood cells in the circulatory system leads to the transportation of a deficient amount of oxygen to various parts of the body. In this disease, the red blood cells become rigid and sticky and they shaped like “sickle” or as the “crescent moons.”

(b)

Summary Introduction

To determine: The specific amino acid which would be less likely like valine in the harm of the hemoglobin if it changed to the glutamate at the 6th position of the β-chain.

Introduction: The condition where there’s an inadequate amount of red blood cells are present in the body is called “sickle cell anemia.” During the presence of an insufficient amount of red blood cells in the circulatory system leads to the transportation of a deficient amount of oxygen to various parts of the body. In this disease, the red blood cells become rigid and sticky and they shaped like “sickle” or as the “crescent moons.”

(c)

Summary Introduction

To explain: The similarity in the function and structure of proteins after the difference in various points of the sequence of the amino acid.

Introduction: The condition where there’s an inadequate amount of red blood cells are present in the body is called “sickle cell anemia.” During the presence of an insufficient amount of red blood cells in the circulatory system leads to the transportation of a deficient amount of oxygen to various parts of the body. In this disease, the red blood cells become rigid and sticky and they shaped like “sickle” or as the “crescent moons.”

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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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