. 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 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 genes

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter17: Developmental Genetics

Section: Chapter Questions

Problem 18TYU: INTERPRET DATA Flower parts are arranged in four concentric circles: sepals, petals, stamens, and...

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Question

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

(D) E class genes

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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?
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?
Suppose 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
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 are phase changes in plant development? What two groups of genes control the formation of the flower? What is the ABC hypothesis?
If the VIN3 gene had a loss-of-function mutation, how do youthink that would affect the phenotypes of summer-annual andwinter-annual Arabidopsis plants?a. Neither type would flower.b. Both types would flower at the proper time.c. The summer type would flower, but the winter type wouldnot.d. The winter type would flower, but the summer type wouldnot.
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, carpels
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A. What is double fertilization? B. What are the products of double fertilization? C. Explain the following quote “As an individual, the endosperm is unique as it has three ancestors and never leaves any descendants.” What are the three ancestors referred to in this quote? And why endosperm does not leave any descendants?
"One of the great myths surrounding the development of human culture over the past 10,000 years is that things got progressively better as we moved from our hunter-gatherer existence to the sublimely elevated state in which we live today." Why does Spencer Wells refer to this "sublime elevation" as a "myth"? Identify a few of his key points as outlined in Pandora's Seed. Respond to one or more of these points, or to the characterization as a whole. Do you agree with Wells? Why, or why not?
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