Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 33.1, Problem 4R
Summary Introduction
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The
Introduction:
The polarity of a plant is developed by the presence of apical-base cellular development of the plants. It may be defined as the arrangement of cells as well as tissues along the main axis of plant.
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You are studying a plant with tissue comprising both green and white sectors. You wish to decide whether this phenomenon is due (1) to a chloroplast mutation of the type considered in this chapter or (2) to a dominant nuclear mutation that inhibits chlorophyll production and is present only in certain tissue layers of the plant as a mosaic. Outline the experimental approach that you would use to resolve this problem.
What is the genetic basis of the wrinkled phenotype of pea seed?
This figure summarises the life cycle of a seed plant. The blue circles named A and B represent the sexually mature individual of each phase of the life cycle.
1) What is this life cycle called?
2) Plant B is in the diploid phase. What is another name for this plant?
3) If A is the haploid phase, in which phase would you find sepals? Write just the letter of the individual corresponding to the correct phase
4) If B is the haploid phase, in which phase would you find synergids? Write just the letter of the individual corresponding to the correct phase
5) If B is the diploid phase, in which phase would you find the nucellus? Write just the letter of the individual corresponding to the correct phase
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7) If A is the diploid phase, in which phase would you find selection on flower colour? Write just the letter of the individual corresponding…
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Life: The Science of Biology
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- What is the phenomenon of apical dominance in plants? How can it be artificially eliminated?arrow_forwardIn a species of tree, seed color is determined by four independently assorting genes: A, B, C, and D. The recessive alleles of each of these genes (a, b, C, and d) produce abnormal enzymes that cannot catalyze a reaction in the biosynthetic pathway for seed pigment. This pathway is diagrammed as follows: A White precursor Yellow ----Orange----- Red --- Blue When both red and blue pigments are present, the seeds are purple. Trees with the genotypes Aa Bb Cc Dd and Aa Bb Cc dd were crossed. (a) What color are the seeds in these two parental genotypes? (b) What proportion of the offspring from the cross will have white seeds? (c) Determine the relative proportions of red, white, and blue offspring from the cross.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
- What is the phenomenonof apical dominance in plants?How can it be artificiallyeliminated?arrow_forwardCan 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? Whorl 1 Whorl 2 Whorl 3 Whorl 4 Wild type sepals petals stamens carpels A class gene Carpels stamens stamen carpel mutants B class gene Sepal Sepal carpel carpel C class gene Sepal petal petal sepal mutants mutantsarrow_forwardIn the Primula plant, the blue flower color is due to malvidin, a pigment encoded by the completely dominant gene (M). Presence of only the recessive gene (m) leads to white flowers. The P locus controls pigment synthesis in the M locus such that dominant gene (P) stops pigment production, and recessive gene (p) allows pigment production. Two plants both having the MmPp genotype were crossed. Answer the following questions and show complete solutions to support your answers. Use the branching method whenever applicable. a. What is the phenotypic ratio of the offspring?b. What type of gene interaction is exhibited by the flower color in Primula?c. What would be the probability of getting plants that are pure-breeding for blue flower color?arrow_forward
- Banana plants, which are triploid, are seedless and thereforesterile. Propose a possible explanation.arrow_forwardWhat would be the most likely effect of deleting flowering locus D (FLD) in Arabidopsis thaliana?arrow_forwardA mutation that breaks which of the following genes would be most likely to produce theanthocyanless phenotype of the green-stem Wisconsin Fast Plants (meaning no purple stems):PAL, CHS, C3H, FLS, or DFR? Explain your reasoning.arrow_forward
- What is a feasible explanation why there is lesser percentage of germination and growth rate in monggo seeds when sprinkled with water added with 3/4 teaspoon as compared to monggo seed set-ups sprinkled with water?arrow_forwardIn Brinjal eggplants, purple fruit is incompletely dominant to white fruit, with the heterozygote being light violet. What is/are the genotype(s) of: the megaspore mother cell of a plant with purple flowers? the polar nucleus of a plant with light violet flowers? the megasporocyte of a plant with white flowers? the companion cell of a plant with light violet flowers?arrow_forwardCan 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.arrow_forward
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