Cleavage
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Meghna Thapar 5 years, 5 months ago
Cleavage is a series of rapid cell divisions without cell growth or gene expression which occurs in early embryogenesis. During cleavage, the cytoplasm is divided into smaller and smaller cells, called blastomeres. Four major holoblastic cleavage types can be observed in general: radial, spiral, bilateral, and rotational. Egg cells that have larger quantities of yolk undergo meroblastic cleavage after fertilization, in which only a portion of the zygote undergoes cleavage.
Characteristics of the cleavage stage.
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