Study Guide for Campbell Biology
Study Guide for Campbell Biology
11th Edition
ISBN: 9780134443775
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece, Martha R. Taylor, Michael A. Pollock
Publisher: PEARSON
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Chapter 46, Problem 3SYK
Summary Introduction

To describe: The way in which birth control pills work.

Introduction: Birth control or contraception is described as the use of devices or practices that prevent the union of sperm and egg.

Summary Introduction

To explain: The way in which the drug RU486 (mifepristone) function.

Introduction: Contraception is a prevention method in which attempts are made to prevent conception. Any device that allows intercourse to occur but reduces the rate of conception is considered to be a device for contraception. There are many forms of contraception that interfere with different steps in the process of becoming pregnant.

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You aim to test the hypothesis that the Tbx4 and Tbx5 genes inhibit each other's expression during limb development. With access to chicken embryos and viruses capable of overexpressing Tbx4 and Tbx5, describe an experiment to investigate whether these genes suppress each other's expression in the limb buds. What results would you expect if they do repress each other? What results would you expect if they do not repress each other?
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