During cytokinesis, centrolecithal zygotes undergo meroblastic cleavage, where the cleavage plane extends only to the accumulated yolk and is superficial.
2.
On the other hand, meroblastic cleavage occurs in animals whose eggs have more yolk; i . e . birds and reptiles.
3.
The key concept is the notion of meroblastic cleavage, which is to say, when the egg is fertilized and begins dividing, the cells produced are initially content to divide themselves up on the surface without developing cell membranes separating themselves from the yolk beneath.
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