Biology (MindTap Course List)
11th Edition
ISBN: 9781337392938
Author: Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher: Cengage Learning
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Chapter 17, Problem 18TYU
INTERPRET DATA Flower parts are arranged in four concentric circles: sepals, petals, stamens, and carpel. According to the ABC model of floral organ development in Arabidopsis, class A genes are needed to specify sepals, the A and B genes to specify petals, the B and C genes to specify stamens, and class C genes to specify the carpel. If a mutation occurs in one of the B genes, rendering it inactive, what will the resulting flowers consist of?
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Can you solve all the parts to this question please
a) What is the role of the LEAFY gene in floral development?
(b) What is the phenotype of the leafy mutant?
(c) Most of the ABC program genes are directly regulated by the transcription factor LEAFY (LFY). Still, LFY is expressed broadly throughout the floral meristem when the discrete A, B, and C domains are established. Discuss how this single broadly expressed transcription factor can generate distinct domains of ABC gene expression. Feel free to use diagrams.
You are a developmental geneticist studying flowering time variation in Arabidopsis. You perform a
mutagenesis screen to identify mutants in the photoperiod pathway. Given what you know about
photoperiodism in Arabidopsis, what phenotype are you looking for and under what photoperiodic
conditions would you perform the experiment?
delayed flowering in long days
delayed flowering in short days
same flowering in short days
early flowering in short days
same flowering in long days
early flowering in long days
Explain how (a) the absence of class B gene expression produces the flower structures seen in class B mutants (see Figure 22.15c) and (b) the absence of class C gene expression produces the structures seen in class C mutants (see Figure 22.15d).
Chapter 17 Solutions
Biology (MindTap Course List)
Ch. 17.1 - Prob. 1LOCh. 17.1 - Describe the classic experiments of Steward,...Ch. 17.1 - Define stem cells, distinguish between embryonic...Ch. 17.1 - What lines of evidence support the principle of...Ch. 17.1 - Prob. 2CCh. 17.1 - What does the ability to produce iPSCs tell...Ch. 17.2 - Prob. 4LOCh. 17.2 - Prob. 5LOCh. 17.2 - Prob. 6LOCh. 17.2 - Prob. 7LO
Ch. 17.2 - Prob. 1CCh. 17.2 - Prob. 2CCh. 17.2 - Prob. 3CCh. 17.2 - Prob. 4CCh. 17.3 - Prob. 8LOCh. 17.3 - Prob. 1CCh. 17.3 - Prob. 2CCh. 17 - Prob. 1TYUCh. 17 - Prob. 2TYUCh. 17 - The anteriorposterior axis of a Drosophila embryo...Ch. 17 - Prob. 4TYUCh. 17 - Homeobox genes (a) are found in fruit flies but no...Ch. 17 - Prob. 6TYUCh. 17 - Prob. 7TYUCh. 17 - Which of the following statements about cancer is...Ch. 17 - Proto-oncogenes code for (a) morphogens (b)...Ch. 17 - Prob. 10TYUCh. 17 - Prob. 11TYUCh. 17 - Prob. 12TYUCh. 17 - CONNECT Why is an understanding of gene regulation...Ch. 17 - What is the reason that scientists study...Ch. 17 - Prob. 15TYUCh. 17 - Prob. 16TYUCh. 17 - EVOLUTION LINK What is the common ground between...Ch. 17 - INTERPRET DATA Flower parts are arranged in four...
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- You are a developmental geneticist and perform a mutagenesis screen in Arabidopsis looking for floral organ mutants. You identify a mutant phenotype that has the following organ arrangement, beginning in whorl 1: Sepal-Sepal-Carpel-Carpel Which class of floral identity genes has been mutated? A-B double mutant O A O SEPALLATA B сarrow_forwardCan you clearly type the answers to the all the parts to this question please a) What is the role of the LEAFY gene in floral development? (b) What is the phenotype of the leafy mutant? (c) Most of the ABC program genes are directly regulated by the transcription factor LEAFY (LFY). Still, LFY is expressed broadly throughout the floral meristem when the discrete A, B, and C domains are established. Discuss how this single broadly expressed transcription factor can generate distinct domains of ABC gene expression. Feel free to use diagrams.arrow_forwardTrace the genetic steps in the development of a peanut plant that isresistant to insect larvae (table given). (Hint: You need to useAgrobacterium.)arrow_forward
- helparrow_forwardCan 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 mutantsarrow_forwardPlease answer question 16arrow_forward
- In roses, the synthesis of red pigment is produced by two steps in a pathway. gene O magenta intermediate - gene P colorless intermediate- red pigment What would the phenotype be of a plant homozygous for a null mutation of gene P? What would the phenotype be of a plant homozygous for a null mutation of gene Q? What would the phenotype be of a plant homozygous for null mutations of genes P and Q? magenta red Match a genotype to each strain. colorless Strain P locus Q locus homozygous null mutation of gene P homozygous null mutation of gene Q homozygous null mutations of genes P and Q Answer Bank plp PIP What F2 ratio is expected from crossing a plant that is homozygous for a null mutation of gene P with a plant that is homozygous for a null mutation of gene Q? Assume independent assortment. 9 colorless : 4 magenta : 3 red 9 red : 4 colorless : 3 magenta O 9 red : 4 magenta : 3 colorlessarrow_forward3.2. From an anatomical point of view, plants undergo cell differentiation. Zinnia elegans is an excellent example of trans-differentiation. This species is used in BT2601 M. many experimental systems that study plant development. Discuss various types of mature cells and tissues that plants undergo during differentiation processes.arrow_forwardUsing the 'ABC model' of floral development, what would you expect the flowers of a mutant plant to look like if both A & B gene function had been destroyed?arrow_forward
- in flowering control of plant, describe a situation wherein there are mutations in at least one or all of the genes responsible for control of the floral development.arrow_forwardMonoecious plants such as corn have either staminate or carpelate flowers. Knowing what you do about the molecular mechanisms of floral development, which of the following might explain the development of single-sex flowers? a. Expression of B-type genes in the presumptive carpel whorl will generate staminate flowers. b. Loss of A-type genes in the presumptive petal whorl will allow C-type and B-type genes to produce stamens instead of petals in that whorl. c. Restricting B-type gene expression to the presumptive petal whorl will generate carpelate flowers. d. All of the choices are correct.arrow_forwardIn 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.)arrow_forward
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