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  • Blastocoel is formed at which stage?  Option: 1 Morula  Option: 2 G

Blastocoel is formed at which stage?
 

Option: 1

Morula
 


Option: 2

Gastrula
 


Option: 3

Blastula
 


Option: 4

None of these
 


Answers (1)

As we have already discussed in Embryonic Development: Cleavage & Formation of Blastocyst -

  • The mitotic division starts as the zygote moves through the isthmus of the oviduct called cleavage towards the uterus and forms 2, 4, 8, 16 daughter cells called blastomeres. 
  • When the blastomeres divide completely the cleavage is called holoblastic cleavage.
  • The embryo with 8 to 16 blastomeres is called a morula.
  • The embryo gradually becomes a 64-celled structure.
  • A cavity is now formed within the cell mass. This cavity is called the blastocyst cavity or blastocoel.
  • The embryo is now termed the blastocyst.
  • The blastocyst is made up of an outer layer of cells called the trophoblast or trophectoderm and an inner cell mass or embryoblast.
  • The trophoblast layer then gets attached to the endometrium and the inner cell mass gets differentiated as the embryo. 

 

 

 

Hence, the correct option is (c).

Posted by

Kshitij

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