What is holoblastic segmentation?

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Cleavage or segmentation may be defined as the series of repeated mitotic cell divisions which occurs in the fertilized egg immediately after the process of fertilization has taken place. It results in the transformation of the zygote (single celled) into a embryo (multicellular) which is further capable for 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.
  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.
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Holoblastic or complete cleavage:

The cleavage is complete involving the whole of the zygote and distinctly separate (but not separated from one another) blas­tomeres are formed. This occurs in homolecithal eggs.

Holoblastic segmentation may be:

Equal:

The blastomeres produced are of equal sizes. The cleavage may be lateral, radial and spiral.

 

Unequal:

The blastomeres produced are of unequal sizes.

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