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.
Can 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.
Chapter 17 Solutions
Biology (MindTap Course List)
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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_forwardIn 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_forwardin 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_forward
- Using 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_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_forwardd. Based on ABC model of floral development, this/these gene/genes controls/control the development of stamens in the third whorl of a flower. (A) A class gene (B) B + C class genes (C) A + B class genes (D) C class genearrow_forward
- Monoecious 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_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? Edit View Insert Format Tools Table 12pt v Paragraph v BIU A 田 !! D2arrow_forward
- Using just the 'ABC model' of floral development what would you need to change in terms of genes or gene expression to get male only flowers, but still have 3 different floral whorls in total? Then what would you need to change to get female flowers and again have three different floral whorls in total?arrow_forwardIn plants, floral organs develop from concentric rings of tissue called whorls. Beginning from the most outside ring, whorl 1 develops into sepals, whorl 2 develops into petals, whorl 3 develops into stamens, and whorl 4 develops into carpels. Analogous to the homeotic mutants of Drosophila, recessive mutations were found in genes that encode transcription factors. These mutants change the organ identity of a given whorl to the identity of a different whorl. The following table shows the mutant phenotypes caused by various floral organ mutations found in the genetic model plant, Arabidopsis. Genotype wild-type ap2 lap2 ap3 lap3 ag lag sepals carpels sepals sepals whorls 2 and 3 whorls 3 and 4 whorls 1 and 2 whorls 2 and 4 All four whorls 1 petals stamens sepals petals Based on the table above, which whorls require a functional AG gene. 2 Whorl stamens stamens carpels petals 3 carpels carpels carpels sepals 4arrow_forward(a) What is the mutant that helps us to understand the adaxial identity of leaf development and the laminar outgrowth? (b) What is the mutant phenotype? (c) Which kind of protein does this gene encode?arrow_forward
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