Life: The Science of Biology
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 19.3, Problem 3R
Summary Introduction

To review:

The condition where the Nanos were inserted and overexpressed at the anterior end of the Drosophila embryo.

Introduction:

There are two maternal effect genes present in the Drosophila, which are known as the bicoid and the Nanos. They are responsible for the determination of the anterior–posterior axis of the embryonic egg.

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The following diagram illustrates four genes from the genome of a certain insect. Different binding sites are labeled in the enhancer region of each gene. enhancer promoter ABC D E Gene 1 A D Gene 2 АС DE Gene 3 ABD Gene 4 In order for a specific gene to be expressed in the insect's cells, all of the gene's binding sites must be bound by transcriptional activators. • The insect's brain cells contain activators that bind to sites A, C, D, and E • The insect's salivary gland cells contain activators that bind to sites A, B, and D Which of the following is the most likely pattern of gene expression for the insect described above? Gene 2 will be expressed in both brain and salivary gland cells Both gene 1 and gene 4 will be expressed in salivary glands, but neither will be expressed in brain cells Gene 1 will be expressed in both brain and salivary glands Both gene 2 and gene 3 will be expressed in brain cells, but neither will be expressed in salivary gland cells
What would be the most likely effect of inhibiting the translation of hunchback mRNA throughout a Drosophila embryo?
What would be the most likely result of injecting bicoid mRNA into the posterior end of a Drosophila embryo and inhibiting the translation of nanos mRNA?
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