BROOKER BIOLOGY
5th Edition
ISBN: 9781307656152
Author: BROOKER
Publisher: MCG/CREATE
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Chapter 30.3, Problem 1CS
Core Skill: Modeling The goal of this modeling challenge is to propose a model that describes the location of algae within a fruticose lichen.
Modeling Challenge: Parts (a) through (c) of Figure 30.11 illustrate three major structural types of lichens: crustose, foliose, and fruticose. Figure 30.11d shows a representative light microscope view of a thin slice of a foliose lichen, which reveals that the green algal cells are located near the upper surface of the flat lichen body. In this location, the photosynthetic cells of the algae are best able to absorb sunlight. Use this information to sketch a structural model of the likely distribution of algal cells in the body of a fruticose lichen. Your model should be a circular cross section through one of the branchlike segments of the lichen. Label the fungal and algal layers.
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Your goal is to produce black seeds resistant to mold. So you make the same cross again (between a homozygous black seeded, mold susceptible parent and a homozygous white seeded and mold resistant parent), and, again, advance progeny by SSD to create 100 F10 generation plants.
Based on the information you obtained from your first crossing experiment (Question #4), how many F10 plants would you expect to have black seeds and be resistant to mold?
Assume that a toxin produced by the mold fungus has been isolated. Only mold resistant seeds will germinate in the presence of the toxin. Could you use this toxin screening procedure to have segregation distortion work in your favor in the F2 generation? Explain your answer.
Info from Question 4
a. P Locus (Seed Color):
Hypothesis: The null hypothesis (H₀) is that seed color is controlled by alleles at a single locus.
Observed Data:
Total white seeds: 45 (resistant plants) + 6 (susceptible plants) = 51
Total black seeds: 7 (resistant…
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Which type of inhibitor would it be and why? (Video 5-2)
Substrate
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