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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

Discuss Concepts Developmental biologist Lewis Wolpert once observed that “it is not birth, marriage or death, but gastrulation which is truly the most important time in your life.” In what sense is he correct?

Summary Introduction

To review:

The reason for which gastrulation is considered as the most important time of life.

Introduction:

A developing zygote undergoes various cellular processes. The initial cellular processes are cleavage, gastrulation, organogenesis, and metamorphosis. The fertilization of the egg results in the beginning of cleavage, a mitotic division of the cell. A morula, 16-32 celled stage is formed, which on the addition of new cells becomes blastula. The cells of the blastula undergo rearrangements and form gastrula. The process of rearrangement is called gastrulation.

Explanation

The process of gastrulation is considered as the most important time of life because it is responsible for developing the fate map for the cells formed in the developing zygote. The process involves differentiation and morphogenic movement of cells. These movements help in the development of three layers of the cells called germ cell layers. These are outer ectoderm, middle mesoderm, and inner endoderm.

These germ layers are involved in developing the body pattern...

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