BIOLOGY 12TH ED (LL) W/ CONNECT
BIOLOGY 12TH ED (LL) W/ CONNECT
12th Edition
ISBN: 9781264898091
Author: Raven
Publisher: MCG
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Chapter 54.4, Problem 2LO
Summary Introduction

Tocompare: The amount of cost and benefits while allotting resources to the process of reproduction.

Introduction: Reproduction is a biological process in which new offsprings are produced from parents. Natural selection only favors the traits that increase the surviving offsprings. Organisms use the resources either to improve their surviving rate or current reproduction.

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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?
You decide to delete Fgf4 and Fgf8 specifically in the limb bud. Explain why you would not knock out these genes in the entire embryo instead.
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.

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BIOLOGY 12TH ED (LL) W/ CONNECT

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