Mechanism of maturation, Biology

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.

Posted Date: 1/24/2013 6:34:46 AM | Location : United States







Related Discussions:- Mechanism of maturation, Assignment Help, Ask Question on Mechanism of maturation, Get Answer, Expert's Help, Mechanism of maturation Discussions

Write discussion on Mechanism of maturation
Your posts are moderated
Related Questions
salient features of phylum Protozoa

Explain the Presumptive Test - Most Probable Number Test? The Presumptive test is used to detect and estimate coliform population of a water sample. This test is carried out by

Left Antero Lateral Thoracotomy Approach :  Arterial and central venous pressure monitoring lines are placed. A left antero lateral thoracotomy is done through the 5th or 4th

Q. What are the vessels that carry blood to the kidneys? Is this blood venous or arterial? The renal arteries are ramifications of the aorta and so the blood filtered by the ki

I need help with making a taxonomic key

A simple method used to identify areas of high conservation priority is the selection of countries according to highest species richness. Among the top 12 countries identified this

what is the excretory organ of agama lizard

When an individual is exposed to foreign serum antigen then a combination of symptoms are produced which is known as serum sickness.

Q. Can Diseases be etiological factor for diabetes? Diseases: In aging, a very important cause of diabetes could be an underlying disease. Diabetes occurs secondary lo some ot

Which vitamin is useful for the clotting of blood?