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.

Hormone	Site of production
$A$. $hCG$ and $hPL$	$(ii)$ Placenta
$B$. Progesterone	$(iii)$ Corpus luteum
$C$. Androgens	$(iv)$ Leydig cells
$D$. Relaxin	$(i)$ Ovary

What happens during the cleavage of an embryo?

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Hormone Site of production
$A$. $hCG$ and $hPL$ $(ii)$ Placenta
$B$. Progesterone $(iii)$ Corpus luteum
$C$. Androgens $(iv)$ Leydig cells
$D$. Relaxin $(i)$ Ovary

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