Question

Differentiate between Blastulation and Gastrulation.

Answer 1

Hint:Blastulation and Gastrulation are both terms that are related to embryo development in biology. Embryonic development comprises several stages that start with the fertilization of an egg with the sperm till the formation of a multicellular embryo.

Complete answer:
The early stages of embryo development includes Cleavage, Blastulation and Gastrulation.

Differentiation between Blastulation and Gastrulation are as follows.

Blastulation	Gastrulation
This is a stage in the embryonic development involved in the formation of blastula.	This is a stage in the embryonic development that is involved in the formation of gastrula.
Blastula is developed from morula and comprises 128 cells.	Gastrula is developed from blastula and comprises more cells than in blastula.
Blastula comprises blastomere which is a hollow sphere of cells and blastocoel which is an inner fluid filled cavity.	Gastrula is a multilayered cell that consists of ectoderm, endoderm and mesoderm as its cell layers.
Blastulation leads to the development of cell polarity, axis formation, cell specification as well as regulation of gene expression.	The three layers of gastrula helps in the formation of new tissues and organs in the developing embryo.
Blastulation is not involved with any cell movement.	Gastrulation is associated with five types of cell movements- invagination, involution, ingression, delamination and epiboly.

Note:Thus both Blastulation and Gastrulation are important stages in the development of an embryo. Recent studies have shown that Gastrulation is more important than Blastulation as this stage is involved with maximum activity ranging from cell movement to a step towards organ formation.