NEET 2025 Latest News Updates By NTA: Registration, Syllabus & Exam Pattern

Cleavage & Formation of Blastocyst MCQ - Practice Questions with Answers

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

Quick Facts

  • Embryonic Development: Cleavage & Formation of Blastocyst is considered one of the most asked concept.

  • 14 Questions around this concept.

Solve by difficulty

A change in the amount of yolk and its distribution in the egg will affect

Concepts Covered - 1

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.

Significance of Cleavage:

  • Cleavage distributes the cytoplasm of the zygote amongst the blastomeres.
  • It allows for morphogenetic movements necessary for cell differentiation, germ layer formation and tissue and organ formation.
  • It converts the unicellular zygote into a multicellular embryo.

Study it with Videos

Embryonic Development: Cleavage & Formation of Blastocyst

"Stay in the loop. Receive exam news, study resources, and expert advice!"

Books

Reference Books

Embryonic Development: Cleavage & Formation of Blastocyst

Biology Textbook for Class XII

Page No. : 52

Line : 20

E-books & Sample Papers

Get Answer to all your questions

Back to top