Cleavage was first observed by
A) Swammerdam
B) Spallanzani
C) F.R. Lillie
D) Leeuwenhoek
Answers
Cleavage was first observed by Swammerdam.
He was the first one to observe cleavage in animal eggs and he observed it in a frog egg in the year 1738.
* Cleavage refers to the division of cells taking place in an embryo.
* After cleavage, the first stage is called the morula followed by the blastula.
* Morula is a mass of cells called blastomeres formed after the cell division of the embryo and this further forms the blastula.
* Cell division takes place in a series starting from the 2 cell stage, followed by the 4 cell, 8 cell and finally the 16 cell stage.
Cleavage was first observed by Swammerdam .
Option A
Explanation:
- Cleavage is the division of zygote that takes place in the embryo inside an egg or inside mother’s womb.
- The single celled zygote divides into two cells, then four, eight and so on into a full fledged Morula, blastula and then a blastocyst through the cleavage divisions.
- They are special types of mitosis divisions which are very fast.
- They undergo mitotic divisions along with special modifications which is called differentiation, that confirm the development of each cell into different types of tissues.
- This whole process was studied by Swammerdam in insect eggs.
Learn more about cleavage
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