EBK BIOLOGY
11th Edition
ISBN: 8220102797352
Author: Raven
Publisher: YUZU
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Chapter 41, Problem 9A
Loss-of-function mutations in the suspensor gene in Arabidopsis lead to the development of two embryos in a seed. After analyzing the expression of this gene in early wild-type embryos, you find high levels of mRNA transcribed from the suspensor gene in the developing suspensor cells. What is the likely function of the suspensor protein?
a. Suspensor protein likely stimulates development of the embryonic tissue.
b. Suspensor protein likely stimulates development of the suspensor tissue.
c. Suspensor protein likely inhibits embryonic development in the suspensor.
d. Suspensor protein likely inhibits suspensor development in the embryo.
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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.
Green fluorescent protein (GFP) can attach and mark other proteins with fluorescence, enabling scientists to see the presence of a particular protein. In an experiment to understand the molecular physiology behind the GA-induced seed germination, a GFP-tagged protein was observed to be moving from the cytoplasm into the nucleus of aleurone layer cells before the detection of alpha-amylase in the endosperm. Based on your knowledge, identify the possible protein(s) with which the GFP is attached in the given situation. Justify your answer.
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.
Chapter 41 Solutions
EBK BIOLOGY
Ch. 41 - Morphogenesis is the development of a. growth...Ch. 41 - Vernalization induces flowering following exposure...Ch. 41 - Prob. 3UCh. 41 - Which of the following is NOT a component of a...Ch. 41 - Megasporcs are produced in a. anthers by mitosis....Ch. 41 - A stamen contains a a. style. b. stigma. c....Ch. 41 - Unlike bee-pollinated flowers, bird-pollinated...Ch. 41 - Prob. 8UCh. 41 - Endosperm is produced by the union of a. a central...Ch. 41 - During the globular stage of embryo development,...
Ch. 41 - Which of the following is NOT a primary meristem?...Ch. 41 - Prob. 12UCh. 41 - The shoot tip of an emerging maize seedling is...Ch. 41 - Asexual reproduction is likely to be most common...Ch. 41 - Prob. 15UCh. 41 - Prob. 16UCh. 41 - Prob. 17UCh. 41 - Prob. 1ACh. 41 - Your roommate is taking biology with you this...Ch. 41 - In Iowa, a company called Team Corn works to...Ch. 41 - Prob. 4ACh. 41 - One of the most notable differences between gamete...Ch. 41 - A plant lacking the WOODEN LEG gene will likely a....Ch. 41 - How would plant development change if the...Ch. 41 - Prob. 8ACh. 41 - Loss-of-function mutations in the suspensor gene...Ch. 41 - Prob. 1SCh. 41 - If you live in a north temperate region, explain...Ch. 41 - In wild columbine flower morphology encourages...Ch. 41 - In most part of the world, commercial potato crops...Ch. 41 - Design an experiment to determine whether light or...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- A. The genes CLV3, CLV1/2 and WUS are involved in maintaining the size of shoot apical meristem. Diagram the interactions among these gene products, using ‘—>’ for positive interactions (i.e. activation) and ‘ —|’ for negative interactions (i.e. repression). B. What phenotype would you expect for a double mutant clv3 wus? And why?arrow_forwardCan you answer part a-c if its true or false a) the AP3 and PI show auto- and cross-regulatory interactions, as well as they form obligate heterodimers to carry out the B class gene function. Therefore, if there is no PI expression, AP3 expression alone is not sufficient for establishing the petal and stamen identities. b) Angiosperm is a group of plants whose seeds are borne within a mature ovary (fruit). c) The organ in different organisms under every variety of forms and functions due to evolutionary development from the same or a corresponding part in a common ancestor is homologous.arrow_forwardYou 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 daysarrow_forward
- Can 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?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_forwardThe 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.arrow_forward
- 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?arrow_forwardWhat would be the effect on flowering time of over-expressing VIN3 (i.e., 35S:VIN3) in a winter annual Arabidopsis plant grown adjacent to a summer annual wild type plant in long days under warm conditions? Assume that the plants germinate at the same time. In answering the question, describe the molecular mechanism that allows you to make this conclusion.arrow_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
- 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).arrow_forwardIf Gus is present in the Arabidopsis Thaliana what is it indicating? I know its to show gene expression, but what is the importance of that? I hope this makes sensearrow_forwardWhat 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.arrow_forward
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