Biology: The Dynamic Science (Mind...

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



Biology: The Dynamic Science (Mind...

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

What is the role of the gray crescent in amphibian development?

Summary Introduction

To review:

The role of the gray crescent in amphibian development.


The amphibian egg is divided into two halves: animal half and vegetal half. The yolk remains concentrated in the vegetal half. The animal half is darkly stained due to the presence of a layer of pigment granules just below the surface. The sperm strikes the egg in the animal half and then the pigmented layer of cytoplasm rotates toward the site of the sperm entry, forming a crescent-shaped region. This region is just opposite to the site of sperm entry and known as gray crescent.


The role of the gray crescent: The gray crescent establishes the dorsal–ventral axis of the embryo. The side that has gray crescent forms dorsal side whereas the side opposite to the gray crescent forms the ventral side. The first cleavage furrow always runs perpendicular to the long axis of the gray crescent equally and forms two blastomeres...

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