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 To
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- Tom studies the floral identity genes. He found a mutant only develop flowers with two whorls of sepals and two whorls of carpels. Which may class(s) of floral homeotic genes be affected based on the ABC model? ______________. (A) A class genes (B) B class genes (C) C class genes (D) E class genesSuppose 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-carpelUsing 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?
- 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.What types of flower structures would you expect to see in whorls 1 through 4 of a mutant plant that failed to produce both class A and class B gene products? a. Carpels, stamens, stamens, carpels b. Sepals, sepals, carpels, carpels c. Sepals, sepals, sepals, sepals d. Carpels, carpels, carpels, carpelsINTERPRET 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?
- The monopteros mutant (a) lacks a primary root (b) develops normally until the plant becomes reproductive (c) has abnormal leaf morphogenesis (d) was discovered in rice after its genome was sequenced (e) is one of only two developmental mutants known in Arabidopsis.What are phase changes in plant development? What two groups of genes control the formation of the flower? What is the ABC hypothesis?Arrange the following flower and fruit development processes in order. (1st step to 5th step)The microspore mother cell produces haploid microspores. => stepThe flower produces pollen grains that will land on the stigma. => StepThe tube cell forms the pollen tube, anchoring on the synergid. => StepFirst sperm will fertilize the egg to form the zygote (becoming the embryo later on). => StepThe ovary wall enlarges forming the pericarp. => Step
- Define combinatorial control in the context of the ABCmodel of floral development.Refer to the figure. a. What gene mutation(s) will result in the loss of production of the sepals? b. What gene mutation(s) will result in the loss of production of the petals? c. What gene mutation(s) will result in the loss of production of the stamens? d. What gene mutation(s) will result in the loss of production of the carpels?Can you define the following terms: Hypogeal germination Tropism Reporter Genes (i.e., GUS and GFP)