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 43, Problem 2Q
Summary Introduction
To review:
A reasonable hypothesis for the difference in effects on ectoderm-derived tissues than on mesoderm-derived tissues due to vitamin A.
Introduction:
The development of body organs in the fetus originates from the three germ layers, which are formed as a result of gastrulation (formation of the massive mass of cells) of the blastula stage of the embryo. The ectoderm is the outer germ layer, which gives rise to the epidermis, hairs, ears, mouthparts, and nervous system; the mesoderm is present in the middle and gives rise to major tissues such as bones, muscles, blood vessels, and heart; and the endoderm is the innermost germ layer that gives rise to the digestive and respiratory tracts.
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Using sea star embryos as an example, describe gastrulation. Explain how the mass of inert yolk affects gastrulation in frog and bird embryos
Component of bilaminar germ disc:
a.Hypoblast and endoderm
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c.Epiblast and ectoderm
d.Ectoderm and mesoderm
Expound how the mass of inert yolk influences gastrulation in amphibians, reptiles and mammals.
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Life: The Science of Biology
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