Biology: How Life Works
3rd Edition
ISBN: 9781319017637
Author: James Morris, Daniel Hartl, Andrew Knoll, Melissa Michael, Robert Lue, Andrew Berry, Andrew Biewener, Brian Farrell, N. Michele Holbrook
Publisher: Macmillan Higher Education
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Chapter 19.4, Problem 11SAQ
Summary Introduction
The cis-regulatory elements are mostly composed of one or more binding sites for transcription factors. Some of which are function as activators and other repress the transcription. Thus, the transcription rate of a gene present in any kind of cell is identified by the transcription factor combination which existing in the cell. The combination of transcription factors in the cell to regulate the expression of a gene is called the combinatorial control.
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What is a meristem? Explain the role of meristems in plant development.
The drooping, bell-like flower Aquilegia canadensis is adapted for cross-pollination. However, if the plant has not been pollinated previously, self-pollination can occur. However, if cross pollination occurs after self-pollination takes place, the pollen from cross pollination reaches the style before the pollen from self-pollination. Using course concepts and vocabulary 1) Provide a reasoning for this phenomenon. 2) Would this adaptation for reproduction be beneficial for the plant?
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.
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- You 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_forwardWhat are phase changes in plant development? What two groups of genes control the formation of the flower? What is the ABC hypothesis?arrow_forwardUsing 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?arrow_forward
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