The reason for the requirement of additional research on the fundamental biological roles of GA (gibberellins) based on its role in Arabidopsis thalliana . Introduction: In the given study, a pickle (pkl) mutation is present in Arabidopsis thaliana plant. This mutation results in the retention of embryonic tissue in the primary root meristem. It was observed that on exposure to gibberellins the mutant root tissue does not spontaneously generate new embryos, which were earlier capable of growing into new plants.

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Chapter 37, Problem 14TYK

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The reason for the requirement of additional research on the fundamental biological roles of GA (gibberellins) based on its role in Arabidopsis thalliana.

Introduction:

In the given study, a pickle (pkl) mutation is present in Arabidopsis thaliana plant. This mutation results in the retention of embryonic tissue in the primary root meristem. It was observed that on exposure to gibberellins the mutant root tissue does not spontaneously generate new embryos, which were earlier capable of growing into new plants.

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The image below represents a flower meristem viewed from above. At the time the image represents, the cells are undifferentiated, although their eventual fates are determined (e.g. carpels, etc.). The rectangles indicate the regions of the meristem where particular genes (A, B, and C) are expressed. Note that these genes are expressed all around the circumference of the meristem at the location indicated; in other words, gene A is active in all cells in the rings labeled sepal and petals. Interpret the figure by filling in the following table: I've numbered each row to help with writing the answer below. Determined by the activity of which gene(s) - A,B,C? Organ Carpel 1. Stamen 2. Petal 3 Sepal 4 Sepals Petals Stamens Bn Carpels

The image below represents a flower meristem viewed from above. At the time the image represents, the cells are undifferentiated, although their eventual fates are determined (e.g. carpels, etc.). The rectangles indicate the regions of the meristem where particular genes (A, B, and C) are expressed. Note that these genes are expressed all around the circumference of the meristem at the location indicated; in other words, gene A is active in all cells in the rings labeled sepal and petals. Sepals Petals Stamens LEnCarpels A close relative of this flower has very large sepals compared to this one. Apply what you know about morphogenesis in plants to make a hypothesis of how gene expression might differ in the relative compared to this plant. Be sure to relate it to the figure above.