Biology
Biology
3rd Edition
ISBN: 9781259824913
Author: Hoefnagels, Mariëlle
Publisher: Mcgraw-hill Education,
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Chapter 19, Problem 2PIT
Summary Introduction

To sketch:

Mutualism, commensalism, and parasitism in the given concept map.

Introduction:

Habitat is a natural environment where species obtain their basic requirements of life. A habitat can be shared by different species which is called an ecosystem. For example, forest ecosystem consists of a variety of species.

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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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