What happens during the cleavage of an embryo | vedclass

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(B) Cleavage is a series of rapid mitotic divisions of the zygote that converts a single-celled zygote into a multicellular structure called a morula.

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Cytoplasm decreases,nuclear material increases.

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(B) Cleavage is a series of rapid mitotic divisions of the zygote that converts a single-celled zygote into a multicellular structure called a morula.During cleavage,the total volume of the embryo remains constant because there is no growth phase ($G_1$ and $G_2$ phases are absent or very short) between the divisions.However,the number of cells increases,and the size of each individual cell (blastomere) decreases.As the cells divide,the nuclear material $(DNA)$ replicates,so the total nuclear material increases.Conversely,the total volume of cytoplasm remains the same,but it is partitioned into smaller and smaller cells,meaning the cytoplasm per cell decreases significantly.

What happens during the cleavage of an embryo?

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