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Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892

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BuyFindarrow_forward

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

A major event during gastrulation is:

a. the movement of surface cells of the blastula into an interior position.

b. the displacement of the archenteron by the blastocoel.

c. the formation of the coelom from the endoderm.

d. the extension of ectoderm and endoderm to form the yolk sac.

e. the development of ectoderm to form epidermal and neural tissues.

Summary Introduction

Introduction:

A zygote undergoes various cellular processes to develop and form the embryo. The early stages of development of zygote involve cleavage, gastrulation, and organogenesis. Gastrulation is the process where the blastomere cells undergo cellular rearrangements. During this stage of development, the embryo is termed as gastrula.

Explanation

Justification/explanation for the correct answer:

Option (a) is the movement of surface cells of the blastula into an interior position. The process of gastrulation involves the rearrangement of blastomeres. This rearrangement helps in the development of the three germ layers, and the surface cells of the blastula move to an interior position. This process develops a body pattern as all the organs and tissues of the body originate from the three layers that are formed. These layers are ectoderm, mesoderm, and endoderm. Hence, option (a) is correct.

Explanation for the incorrect answers:

Option (b) is the displacement of the archenteron by the blastocoel. The blastocoel is displaced by archenteron after gastrulation. Archenteron is not displaced by blastocoels...

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