Spermatogenesis - gametogenesis, Biology

Assignment Help:

Spermatogenesis - Gametogenesis

The procedure of maturation of spermatogonia into sperms starts at puberty (about 14 years) and continues into old age. The spermatogonia that lie dormant in the testis since the foetal period begin to increase in number at puberty. After various mitotic divisions the spermatogonia transform into primary spermatocytes which are one of the largest germ cells in the tubules. Each of these primary spermatocytes goes through reduction division to form 2 haploid secondary spermatocytes. Subsequently, these go through a 2nd reduction division forming four haploid spermatids. The spermatids slowly transform into four mature sperms by a general processes of differentiation known as spermiogenesis. This whole process of spermatogenesis takes approximately 64 days. The mature sperm is a free swimming actively mobile cell consisting of head and a tail. The anterior two thirds of the nucleus in the head is covered through acrosome, an organelle that contains enzymes that help the sperms to penetrate the outer covering and membranes of the ovum.


Related Discussions:- Spermatogenesis - gametogenesis

Explain the importance of the auxin, a) How is the milk production regulate...

a) How is the milk production regulated by hormones in human female? Define. b) Explain the importance of the auxin / cytokinin ratio in plant tissue culture.

Predominant feature of steatorrhoea, Q. Predominant feature of steatorrhoea...

Q. Predominant feature of steatorrhoea? A predominant feature is delayed and defective absorption of fat, which results in bulky stools containing large quantities of fat (know

Explain what is fungi, Explain what is Fungi? The fungi are spore-beari...

Explain what is Fungi? The fungi are spore-bearing eukaryotic organisms without chlorophyll and having absorptive nutrition. These reproduce sexually as well asexually. Primari

Female reproductive system - graffian follicle, GRAFFIAN FOLLICLE - ...

GRAFFIAN FOLLICLE - It appears as knob or stigma in medulla. It is round, discovered by Graff. It is covered by 2 layers - thecae externa & theca interna. From theca i

Define regulation of intracellular ca concentration, Define Regulation of i...

Define Regulation of intracellular Ca concentration? The cytoplasmic calcium concentration is regulated by a series of calcium pumps, which either concentrate calcium ions with

What is the etiology of cholera, Q. What is the etiology of cholera? T...

Q. What is the etiology of cholera? The most common cause of cholera is consumption of food or drinking water that has been contaminated with the bacteria. It is important to

Agro-industrial -cereal and gram by-products, Cereal and Gram By-Products ...

Cereal and Gram By-Products Agro-processing is now regarded as the sun rise sector in view of its large potential in maintaining the nutritional quality of processed feed resource

Nervous system - cranial nerves, CRANIAL NERVES 12 pairs. Total weig...

CRANIAL NERVES 12 pairs. Total weight 12 gms. Upto amphibian 10 pairs cranial nerves are present. 1, 2, 8, - sensory. 3, 4, 6, 11, 12, motor. 5, 7, 9, 10 - mixed. 3

Mechanisms that affect the heart rate, Mechanisms that Affect the Heart Rat...

Mechanisms that Affect the Heart Rate Two different mechanisms affect the heart rate. Nerve impulse to the pacemaker region and hormonal influences. A branch of the vagues ner

Explain biochemical investigation, Explain Biochemical investigation Bi...

Explain Biochemical investigation Biochemical  investigations:  These help  to  reveal nutrients and metabolites in blood and /or urine, and/or faeces that indicate an infectio

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