quora

Gametogenesis - Essay Example

Comments (1) Cite this document
Summary
In the paper “Gametogenesis” the author analyzes a biological process by which diploid or haploid precursor cells undergo cell division and differentiation to form mature haploid gametes. Gametogenesis occurs by meiotic division of diploid gametocytes into various gametes…
Download full paperFile format: .doc, available for editing
GRAB THE BEST PAPER95.3% of users find it useful
Gametogenesis
Read TextPreview

Extract of sample
"Gametogenesis"

Download file to see previous pages In the early stage of embryonic development, groups of cells become committed to differentiate into various cell types such as liver cells, nerve cells and muscle cells. One group of cells becomes committed to form the germ cell line, cells that eventually develop into eggs if the embryo is female or sperm if the embryo is male. These are the only cells that undergo meiosis. These committed cells, primordial germ cells increase in number through mitotic cell division. Later, they divide meiotically to produce mature sperm or eggs. The process of forming mature eggs is called oogenesis (Aberts et al, 2002; Snustad and Simmons, 2002).
The primordial germ cells that migrate to the developing ovary during early embryogenesis become oogonia. They multiply rapidly, undergoing several rounds of mitotic cell division and eventually differentiate into primary oocytes. The primary oocytes begin meiotic cell division and complete the diplotene stage of prophase I and then division stops. They remain in this suspended prophase. During this period, the oocyte undergoes many changes that prepare it for the completion of meiosis and for fertilization. It acquires a special coat that protects the developing egg from mechanical damage and in many cases acts as a barrier to sperm from other species. Just beneath the membrane cortical granules develop that alter the egg coat so that only a single sperm fertilizes an egg. In addition, the primary oocyte accumulates large quantities of nutrients and other molecules that nourish the early embryo and coordinate as well as direct its early development. With the attainment of sexual maturity, the next stage of oocyte development occurs, triggered by hormones. The oocyte completes meiosis I and two haploid nuclei are formed, each containing one member of each chromosome pair in a replicated state. But cytokines are very asymmetrical. One cell, called secondary oocyte gets virtually all the cytoplasm and is ancestral to the mature egg. The other cell, called a polar body, gets very little cytoplasm. Both of these cells , the secondary oocyte and the polar body undergo meiosis II to produce four haploid nuclei. Again cytokinesis is asymmetrical: Meiosis II in the secondary oocyte produces one large cell, the ovum, or egg, which has virtually all the cytoplasm and a small polar body with very little cytoplasm. Thus, of the four meiotic products, only one forms the mature egg. the polar bodies, which are small with little cytoplasm to support their metabolism, eventually degenerate (Aberts et al, 2002; Snustad and Simmons, 2002). Oogenesis occur in the ovaries of the female. Each primary oocyte is surrounded by a spherical cluster of cells in a cavity or sac called the primary or Graafian follicle. In response to hormone signals, the primary oocyte completes meiosis I to become a secondary oocyte. the follicle then ruptures, releasing the secondary oocyte into the oviduct, where it begin the second meiotic division. in humans, the oviduct is called the Fallopian tube. the release of the secondary oocyte from the Graafian follicle is called ovulation (Aberts et al, 2002; Snustad and Simmons, 2002). As the secondary ooc ...Download file to see next pagesRead More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“Gametogenesis Essay Example | Topics and Well Written Essays - 1000 words”, n.d.)
Retrieved de https://studentshare.org/biology/1446367-gametogenesis
(Gametogenesis Essay Example | Topics and Well Written Essays - 1000 Words)
https://studentshare.org/biology/1446367-gametogenesis.
“Gametogenesis Essay Example | Topics and Well Written Essays - 1000 Words”, n.d. https://studentshare.org/biology/1446367-gametogenesis.
  • Cited: 0 times
Comments (1)
Click to create a comment or rate a document
mp
mparker added comment 1 month ago
Student rated this paper as
The topic of "Gametogenesis" is quite often seen among the tasks in university. Still, this sample opens a brand new perspective of seeing the question. I’ll use the idea for my own sample.
CHECK THESE SAMPLES - THEY ALSO FIT YOUR TOPIC
Economy
The three chapters on occupation and earnings discuss differences and trends in these domains based on human capital and labor market discrimination. Chapter 5: Differences in Occupations and Earnings: Overview This chapter provides an introductory overview into the various dynamics influencing occupations and earnings including preferences among employers and employees, family issues, financial constraints, education and human capital.
3 Pages(750 words)Essay
The Challenges for Inclusive Education in China
This report discusses some of the challenges to implementing inclusive education in China where several attempts have been made since the 1980s and 1990s. Education is the right of every child and educational opportunities should be based on equity rather than privilege. Instituting inclusive education requires a perceptual shift in addition to supportive policies, resources, curriculum and human resource development.
7 Pages(1750 words)Essay
Biology and gender
Out of 23 pairs of somatic chromosome in humans, 22 pairs are somatic and 1 pair is sex chromosomes. The gametes or reproductive cells are haploid, with only 22 representing somatic chromosomes and one sex chromosome. In case of males, the sex chromosome may be of X or Y type, whereas in case of the female partner, this is universally only Y type During sexual intercourse, in the process of a male sperm uniting with a female ovum, millions of sperms approach a single ovum ultimately to be united, to create a zygote that has again the diploid chromosome numbers restored.
7 Pages(1750 words)Essay
Gene Expression
The contrast between the openness of euchromantin and the compactness of the heterochromatic implied that the euchromatic is the location of most gene function and led to the neglect of heterochromatin.
8 Pages(2000 words)Essay
Development of Reproductive system in Fetus; Genetic, endocrine and environmental factors
The fertilization stage determines the chromosomal sex of the offspring. The development of the sexual and reproductive system begins after the four weeks of pregnancy with the development of gonadal ridges on the surface of paired intermediate
5 Pages(1250 words)Research Proposal
Parthenogenesis
However, many of us may have not known that one type of "cloning" have been occurring in nature since time immemorial. In nature, some plants and animals appear to "clone" themselves when they reproduce without the fertilizing their egg - this process is called parthenogenesis.
11 Pages(2750 words)Essay
Infertility and Treatment
However, medical science has progressed so much that most of the infertility problems have solutions. There is more hope for people without children as a number of treatments exist to correct these disorders. It is estimated that infertility affects approximately 10% of people of reproductive age, and 15% of couples.
4 Pages(1000 words)Essay
The Role of Mitosis and Miosis In Cancer Tistes Antigen (CTA)
The main problem is caused by cancer testis (CT) antigens are a group of proteins united by their importance in development and in cancer immunotherapy. In general, expression of these proteins is restricted to male germ cells in the adult animal. However, in cancer these developmental antigens are often re-expressed and can serve as a locus of immune activation.
4 Pages(1000 words)Literature review
Genetics assignment three
The imprinting pattern of inheritance is analogous to sex influenced inheritance is true since some sex dissimilarities in appearance of inherited qualities may result from the genetic imprinting (Judd 21). Genetic imprinting, therefore,
2 Pages(500 words)Essay
Effects of steroids on calcium activated potassium channels and secretion of LH and FSH in Atlantic cod (Gadus morhua)
The pituitary gland is comprised of two main compartments, that is, the neural (neurohypophysis) and non-neural (adenohypophysis). LH and FSH gonadotropes are located on the adenohypophysis compartment and there is empirical
11 Pages(2750 words)Essay
Babcock marine case study
It is a member of the aircraft carrier alliance alongside the BAE systems, ministry of defense and Thales (Gilespie, 2007). This alliance is currently in progress of building two large aircraft carriers namely HMS queen Elizabeth and the HMS Prince of Wales.
9 Pages(2250 words)Assignment
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.
Let us find you another Essay on topic Gametogenesis for FREE!
logo footer
Contact us:
+16312120006
Contact Us Now
FREE Mobile Apps:
  • StudentShare App Store
  • StudentShare Google play
  • About StudentShare
  • Testimonials
  • FAQ
  • Blog
  • Free Essays
  • New Essays
  • Essays
  • Miscellaneous
  • The Newest Essay Topics
  • Index samples by all dates
Join us:
Contact Us