Biology
Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 20, Problem 1CQ

a.

Summary Introduction

To determine: Whether mutation has occurred in the segmentation gene or the homeotic gene if three abdominal segments are missing.

Introduction: In Drosophila, regulation of the process of pattern formation and morphogenesis occurs with the help of certain genes such as segmentation genes and homeotic genes. A mutation in these genes leads to alteration in the patterns of segmentation and morphology of the organism.

b.

Summary Introduction

To determine: Whether mutation has occurred in the segmentation gene or the homeotic gene if one abdominal segment has legs.

Introduction: In Drosophila, regulation of the process of pattern formation and morphogenesis occurs with the help of certain genes such as segmentation genes and homeotic genes. A mutation in these genes leads to alteration in the patterns of segmentation and morphology of the organism.

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If you observed fruit flies with the following developmental abnormalities, would you guess that a mutation has occurred in a segmentation gene or a homeotic gene? Explain your guess. A. Three abdominal segments were missing. B. One abdominal segment had legs. C. A fly with the correct number of segments had two additional thoracic segments and two fewer abdominal segments.
If a fertilized Drosophila egg is punctured at the anterior end and a small amount of cytoplasm is allowed to leak out, what will be the most likely effect on the development of the fly embryo?
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