During embryogenesis,the zygote undergoes:

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(D) After the formation of the zygote,it undergoes successive mitotic divisions known as cleavage to form a mass of cells.Cleavage is essentially mito

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(D) After the formation of the zygote,it undergoes successive mitotic divisions known as cleavage to form a mass of cells.Cleavage is essentially mitosis without a resting phase ($G_1$ or $G_2$ phases are absent or very short).Since mitosis maintains the same genetic constitution,all resulting cells are genetically identical.Cleavage is subsequently followed by cell differentiation processes,such as gastrulation,which eventually lead to the formation of different tissues and body parts.

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