Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 35, Problem 9IQ
The following diagram depicting the ABC hypothesis shows the active genes in each whorl and the resulting anatomy of a wild-type flower.
- a. Fill in the following table to indicate which organs are produced in the whorls in a normal flower. In a mutant that lacks a functional gene A (“mutant A”), what gene expression pattern and resulting flower organ arrangement would be produced? (Remember that the lack of A activity removes the inhibition of gene C, and vice versa.)
- b. If you had a double-mutant plant that had no gene activity for B or C, what would the resulting flower look like?
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In roses, the synthesis of red pigment is by two steps ina pathway, as follows:colorless intermediate gene Pmagenta intermediate red pigment gene Qa. What would the phenotype be of a plant homozygousfor a null mutation of gene P?b. What would the phenotype be of a plant homozygousfor a null mutation of gene Q?c. What would the phenotype be of a plant homozygousfor null mutations of genes P and Q?d. Write the genotypes of the three strains in parts a, b,and c.e. What F2 ratio is expected from crossing plants fromparts a and b? (Assume independent assortment.)
A. The genes CLV3, CLV1/2 and WUS are involved in maintaining the size of shoot apical meristem. Diagram the interactions among these gene products, using ‘—>’ for positive interactions (i.e. activation) and ‘ —|’ for negative interactions (i.e. repression).
B. What phenotype would you expect for a double mutant clv3 wus? And why?
Can you answer both questions please
(b) Based on the ABC model, what would be the predicted phenotype of a double AB mutant?
(c) In developing flowers of dioecious Spinach and Thalictrum, stamens are not developed in female flowers,
and carpels are not developed in male flowers. What is the simplest model of ABC class gene expression that
might explain this?
Whorl 1
Whorl 2
Whorl 3
Whorl 4
Wild type
sepals
petals
stamens
carpels
A class gene Carpels
stamens stamen carpel
mutants
B class gene
Sepal Sepal carpel carpel
C class gene Sepal petal petal sepal
mutants
mutants
Chapter 35 Solutions
Study Guide for Campbell Biology
Ch. 35 - Prob. 1IQCh. 35 - Prob. 2IQCh. 35 - Prob. 3IQCh. 35 - Prob. 4IQCh. 35 - Prob. 5IQCh. 35 - Prob. 6IQCh. 35 - Plant biologists use CRISPR-Cas technology to...Ch. 35 - Review the role of microtubules in the orientation...Ch. 35 - The following diagram depicting the ABC hypothesis...Ch. 35 - How does the indeterminate growth pattern of...
Ch. 35 - Prob. 2SYKCh. 35 - Which of the following is not a reason that...Ch. 35 - Prob. 2TYKCh. 35 - Prob. 3TYKCh. 35 - Prob. 4TYKCh. 35 - Prob. 5TYKCh. 35 - Prob. 6TYKCh. 35 - Prob. 7TYKCh. 35 - Which of the following is not a primary meristem?...Ch. 35 - Prob. 9TYKCh. 35 - Prob. 10TYKCh. 35 - Prob. 11TYKCh. 35 - You are a companion cell in an angiosperm. What...Ch. 35 - Prob. 13TYKCh. 35 - Prob. 14TYKCh. 35 - Prob. 15TYKCh. 35 - The results from genetic studies of which of the...Ch. 35 - Prob. 17TYKCh. 35 - Prob. 18TYK
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