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What are homeotic genes? Please exaplain ow they control the sequence of whorl development in flowers according to the ABCDE model.
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- The ABCDE Model of flower development dictates the combination of transcription factors require to initiate each whorl of a flower. Based on the diagram below, what would happen if: Carpels and ovules Sepal Petal Stamen 2 4 Whorl A Genes E 25-40 The ABCDE model of floral organ determination in Arabidopsis In addition to the A-, B-, and C-function genes of the ABC model, this model includes two additional gene classes, D and E. In the ABCDE model, class A + E genes specify sepals; class A + B + E, petals; class B +C +E, stamens; class C + E, carpels; and class C+ D + E, ovules. 1. Gene D was non-functional: 2. Gene E was non-functional: 3. Only Gene A was functional: 4. Gene B and E were non-functional: 5. Only Gene A and Gene E were functional: Hint: If Gene A was non-functional the flower would have no sepals or petals, it would be composed of only stamens and carpels.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? Edit View Insert Format Tools Table 12pt v Paragraph v BIU A 田 !! D2Can 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.
- What will be the flower structure of a plant in which expression of the following genes is inhibited in the specified whorls? Q. Expression of class B genes is inhibited in the second whorl, but not inthe third whorl.What will be the flower structure of a plant in which expression of the following genes is inhibited in the specified whorls? Q. Expression of class A genes is inhibited in the second whorl, but not in the first whorl.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.
- 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?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 сSuppose a flower had normal expression of genes A and Cand expression of gene B in all four whorls. Based on the ABChypothesis, what would be the structure of that flower, startingat the outermost whorl?(A) carpel-petal-petal-carpel(B) petal-petal-stamen-stamen(C) sepal-carpel-carpel-sepal(D) sepal-sepal-carpel-carpel
- What are phase changes in plant development? What two groups of genes control the formation of the flower? What is the ABC hypothesis?d. 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 geneUsing 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?