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

Apply Evolutionary Thinking In this chapter, you have learned that cleavage and gastrulation differ among vertebrates that have different amounts of yolk in their eggs. What are some features of early development that have been conserved across vertebrate groups during their evolution?

Summary Introduction

To review:

The features of early development that are conserved across all vertebrates.


Early development of an organism includes three stages of development. These are cleavage, gastrulation, and neurulation. Cleavage begins as soon as the egg is fertilized. It includes the mitotic division of the zygote to produce gastrula. The gastrula undergoes gastrulation that leads to the formation of the germ layers by morphogenetic rearrangements of the cells.


The process of cleavage and gastrulation are known to have evolved to some extent. The difference among the vertebrate species having a different amount of yolk is represented during the process of cleavage and gastrulation. These two stages of early development are not conserved among all the vertebrate groups.

These processes are followed by neurulation. It is the folding process that involves the transformation of neural plate into a neural tube. This stage of early development is conserved among all the groups of vertebrates. The differentiation and thickening of neuroectodermal tissue from the ectoderm form the neural plate. The neural plate is separated from the ectoderm by the neural plate border...

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