Q. 12

Name the developm

Answer :

The developmental stage that gets implanted in a pregnant human female is blastocyst in uterus.

The following events lead to implantation:

- Fertilisation results in the formation of a diploid zygote.

- As zygote moves through the uterus, mitotic divisions occur in the zygote that form 2, 4, 8, 16 daughter cells called blastomeres.

- The embryo with 8-16 blastomeres is known as morula.

- Morula continues to divide and then transforms into blastocyst;

- Blastomeres of blastocyst get arranged into an outer layer called trophoblast and inner cells called inner cell mass.

- Trophoblast layer of blastocyst gets attached to the endometrium while inner cell mass differentiate to form embryo.

- After attachment, the uterine cells divide rapidly and cover the blastocyst to become embedded in the endometrium of the uterus. This is called Implantation and pregnancy starts after implantation.

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