Question

What is the difference between blastocyst and blastula?

Answer 1

Blastula:

It refers to an animal embryo at the early stage of development when it is a hollow ball of cells.

Blastocyst:

It refers to a mammalian blastula in which some differentiation of cells has occurred.

Differences between blastula and blastocyst:

Blastula	Blastocyst
Blastula occurs in animals.	Blastocyst occurs in mammals.
2. The outer cell layer of the blastula is known as blastomeres.	2. The outer cell layer of the blastocyst is called the trophoblast.
3. Blastula does not contain an inner cell mass.	3. The blastocyst contains an inner cell mass.
4. Examples: Animals	4. Examples: Mammals