CONNECT ACCESS FOR BIOL 01204 <C>
CONNECT ACCESS FOR BIOL 01204 <C>
12th Edition
ISBN: 9781264443123
Author: Raven
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 50.3, Problem 2LO
Summary Introduction

To explain: The role of T helper cells.

Introduction: Adaptive immunity is also referred to as acquired immunity. It is characterized as the dual system consisting of humoral and cellular components. B cells are chiefly involved in humoral immunity and they neutralize threats outside the cells. T cells are chiefly involved in cellular immunity and they act on threats outside the cells.

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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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You implant an FGF10-coated bead into the anterior flank of a chicken embryo, directly below the level of the wing bud. What is the phenotype of the resulting ectopic limb?  Briefly describe the expected expression domains of 1) Shh, 2) Tbx4, and 3) Tbx5 in the resulting ectopic limb bud.

Chapter 50 Solutions

CONNECT ACCESS FOR BIOL 01204 <C>

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