EBK HUMAN PHYSIOLOGY
EBK HUMAN PHYSIOLOGY
8th Edition
ISBN: 9780134704227
Author: Silverthorn
Publisher: YUZU
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Chapter 6, Problem 22RQ

a.

Summary Introduction

To determine: The name of the phenomenon that explains the signal cascade for rhodopsin.

Introduction: Receptors are the structures that compose of proteins and promote binding of certain molecules that act as signaling molecules and bring changes in the functioning of the cell. The receptors are specific and allow the binding of molecules only from a specific family. There are three different ways in which receptors function namely amplification, integration, and relaying of the signal.

b.

Summary Introduction

To determine: The total number of GMP molecules that will be formed by a single rhodopsin molecule.

Introduction: Rhodopsin pigment is found in the rods of the retina, and it is highly sensitive to light. Hence, these cells play an important in visualization in the dark. Rhodopsin triggers a series of reactions and leads to photobleaching. Rhodopsin is important for visual phototransduction reaction in the rod cells.

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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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EBK HUMAN PHYSIOLOGY

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