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
Ancestral Unicellular Organism So far in this unit we have considered the characteristic of body designs that are shared by various animals and the different body plans that d

Define the Requirements of Root-End Filling Materials 1.  Seal well 2.  Well tolerated by periapical tissues "Biocompatible" 3.  Easily inserted "manipulated" 4.  Unr

Name three sources of biofuel

Explain Objectives of Root-End Resection Apicoectomy a) Removal of untreated apical portion of the root, b) Enable the obturator to determine the cause of failure,  c) To

Explain the The Lysogenic Cycle in diversity of life? The Lysogenic Life History of Bacteriophage Viruses. Even though viruses are structurally simple, consisting of merely a n


Explain the eligibility of Cardiac rehabilitation ? Cardiac rehabilitation services are prescribed for patients who: 1) Have had a myocardial infarction. 2) Have had coronary b

Changes in the conformation of molecules - Qualitative Changes You may recall that linear chain of amino acids of a protein folds into a characteristic structure. Acidic resid

For many of the mammalian Hox genes, it has been possible to determine that some of them are more similar to one of the insect HOM-C genes than to the others. Describe an experimen

Define Metabolic Aberrations and Clinical Manifestations? The state of obesity brings about certain alterations in the normal body processes which are enumerated herewith and h