Mechanism of maturation, Biology

Assignment Help:

Mechanism of Maturation

The basic mechanism of maturation of ovum is more or less similar in all organisms. The primordial germ cells that enter into the ovary divide mitotically and produce oogonial cells. The oogonial cells grow in size and become primary oocyte. The primary oocyte undergoes the first meiotic division and forms two haploids cells-a secondary oocyte and a polar body.

The secondary oocyte undergoes the second meiotic division to produce an ovum and a polar body. In most vertebrates the second meiotic division is completed only outside the ovary after fertilisation. The polar body formed as a result of first meiotic division may divide again to produce two more polar bodies. All the polar bodies eventually degenerate. Thus the meiotic process in oogenesis results in one ovum from a single oogonium unlike spermatogenesis where each spermatogonial cell gives rise to four sperm.


Related Discussions:- Mechanism of maturation

Epithelial Cells, What are all teh parts of a simple ciliated columnar epit...

What are all teh parts of a simple ciliated columnar epithilial cell?

Developmental biology, a sea urchin egg is injected with an mRNA encoding t...

a sea urchin egg is injected with an mRNA encoding the cadherin protein fragment described above and an mRNA encoding the Pmar1 transcription factor. The embryo is allowed to devel

Explain the protection of erythrocytes and cell membrane, Explain the Prote...

Explain the Protection of erythrocytes and cell membrane? Protection of erythrocytes: Vitamin E protects erythrocytes from haemolysis by the production of oxidizing agents

Main species of taenias that cause human diseases, Q. What are the two main...

Q. What are the two main species of taenias that cause human diseases? The two chief species of taenias that cause disease in humans are Taenia solium, or the pork tapeworm, an

Explain the term rastelli operations, Explain the term Rastelli operations ...

Explain the term Rastelli operations ? This is the operation of choice for transposition with VSD and left ventricular outflow obstruction. The principle of this operation is:

Explain about freezing point - properties of solutions, Freezing Point - Pr...

Freezing Point - Properties of Solutions The freezing point of a material is the temperature at which it changes from a liquid to a solid. A liquid freezes when its vapour pre

Subcellular particle, Name the subcellular particle where the electron tran...

Name the subcellular particle where the electron transport chain is located. Mitochondria is  the subcellular particle where  the electron transport chain is located.

Determine the significance of lingual nerve and artery, Significance of Lin...

Significance of Lingual nerve and artery Because the nerve lies medial to the retromolar pad, incisions in this region should remain lateral to the pad and mucosal reflection s

Formation and role of hypoblast, Formation and Role of Hypoblast Hypo...

Formation and Role of Hypoblast Hypoblast is made as a result of two processes. First, some cells individually leave the blastoderm and move down via poly invagination into t

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd