Cleavages that occur around the top of the yolk, instead of dividing the whole egg, are said to be meroblastic or incomplete. This type of cleavage is characteristic of eggs with a large amount of yolk, such as those in birds and reptiles, where the yolk restricts the cleavage furrows from penetrating the entire egg.
Cleavages that occur around the top of the yolk, instead of dividing the whole egg, are said to be _____?
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