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Cleavage may be defined as the series of repeated mitotic cell divisions which occur in the fertilized egg immediately after the process of fertilization has taken place. It results in the transformation of the zygote (single-celled) into an embryo (multicellular) which is further capable of growth. Different types of cleavage are:

1. Holoblastic cleavage: The fertilized eggs which contain a little amount or no yolk, the cells are divided completely by cytokinesis. This is known as holoblastic or total cleavage. Cleavage in amphibians is holoblastic. 
2. Meroblastic cleavage: The fertilized eggs which contain a large amount of yolk, the cells are not divided completely by cytokinesis. This is known as meroblastic cleavage or partial cleavage.It is observed in chicks. 

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