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.

Column-$I$	Column-$II$
$A$. $1^{st}$ month	$i$. First movement of foetus
$B$. $2^{nd}$ month	$ii$. Major organ system
$C$. $3^{rd}$ month	$iii$. Foetal heart
$D$. $5^{th}$ month	$iv$. Limbs $\&$ digits

What happens during the cleavage of an embryo?

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Which one of the following statements with regard to embryonic development in humans is correct?

Where does the development of the zygote take place in viviparous organisms?

Match the following:

Column-$I$ Column-$II$

$A$. $1^{st}$ month $i$. First movement of foetus

$B$. $2^{nd}$ month $ii$. Major organ system

$C$. $3^{rd}$ month $iii$. Foetal heart

$D$. $5^{th}$ month $iv$. Limbs $\&$ digits

The first sign of the growing foetus may be noticed by listening to the heart sound carefully through the stethoscope. The embryo's heart is formed after one month of pregnancy. Which of the following gestation periods is correctly matched?

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