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What is oogenesis?


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Answered 2007-05-14 23:19:31

Oogenesis or rarely oögenesis is the creation of an ovum (egg cell). In mammals, oogenesis occurs in the ovarian follicle of the ovary. Oogonial transformation into oocytes (oocytogenesis) is completed either before or shortly after birth. Further development comes to a rest during prometaphase I of meiosis, known as the dictyate stage, until puberty triggers oogenesis. In ascaris, the oocyte does not even begin meiosis until the sperm touches it. Oogenesis is the process in which the primary oocyte turns to an ovum undergoing meiosis. At first there is a diploid oocyte called the primary oocyte. Meiosis I occurs in which synapsis occurs and tetrads form and crossing over as well and this becomes the secondary oocyte and the first polar body. The haploid secondary oocyte undergoes meiosis II forming an ootid and another polar body. The first polar body also undergoes meiosis II forming two more polar bodies for a total of three. All three polar bodies at the end of Meiosis II disintegrate leaving only the ootid which undergoes maturation and eventually matures into an ovum. It is interesting to note that such an important process in animal life cycles is done completely without the aid of spindle-coordinating centrosomes. Many protists produce egg cells in structures termed archegonia. Some algae and the oomycetes produce eggs in oogonia. In the brown alga Fucus, all four egg cells survive oogenesis, which is an exception to the rule that generally only one product of female meiosis survives to maturity. In plants, oogenesis occurs inside the female gametophyte via mitosis. In many plants such as bryophytes, ferns, and gymnosperms, egg cells are formed in archegonia. In flowering plants, the female gametophyte has been reduced to an eight-celled embryo sac within the ovule inside the ovary of the flower. Oogenesis occurs within the embryo sac and leads to the formation of a single egg cell per ovule.

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Related Questions

Oogenesis results in?

oogenesis results in the production of


How do oogenesis?

oogenesis The production and development of an egg


Where does Oogenesis occurs?

Oogenesis occurs in the ovaries of females.


Cells oogenesis produce?

oogenesis is the process of making an egg


Where does oogenesis take place?

Oogenesis takes place in the female gonads of most animals. The eggs are created through oogenesis in the ovaries of women.


What is the similarities of spermatogenesis and oogenesis?

The similarity of Spermatogenesis and Oogenesis is that the both of them is needed in producing an offspring.


What does gp mean in oogenesis?

Oogenesis is the creation of the egg cell called the ovum in the human species. It is unclear what "GP" stands for in reference to oogenesis without having more information.


What is the process of oogenesis?

oogenesis is the development and maturation of the ovum, a process which occurs within the female reproductive system.


What are spermatogenesis and oogenesis?

Spermatiogenesis is the process of producing sperm and oogenesis is the process of producing egg cells.fertilization


Final product of oogenesis is one?

The final product in oogenesis is one egg and three polar bodies.


What is oogenesis gametogenesis?

Gametogenesis is the production of sex cells. Oogenesis, a type of gametogenesis, is the production of egg cells.


What is the benefit of uneven production of gametes in oogensis?

Oogenesis (misspelled as oogenesis) is the creation of an egg cell. The benefit of uneven production of gametes in oogenesis is one haploid cell gets the majority of the nutrients.


Where does oogenesis start?

ovary


Oogenesis occurs in the?

ovaries


What are the products of oogenesis?

its your face


What occurs in the ovaries?

oogenesis


When does oogenesis stop?

at birth


Oogenesis takes place in what part of a female?

Since oogenesis is the development of an ovum (egg), it takes place in the ovaries.


How does oogenesis and spermatogenesis differ?

Oogenesis and spermatogenesis differ in how many cells are formed. Oogenesis forms 4 eggs but only 1 is viable, while spermatogenesis forms 4 viable sperm cells.


What has the author Chr P Raven written?

Chr. P. Raven has written: 'Oogenesis' -- subject(s): Oogenesis, Cytogenetics 'Oogenesis: the storage of developmental information' -- subject(s): Oogenesis, Cytogenetics 'Cytological and cytochemical investigations on the development of Sabellaria alveolata L' -- subject(s): Sabellariidae, Embryology, Worms


Briefly describe the process of oogenesis?

Oogenesis or rarely oögenesis is the creation of an ovum (egg cell). It is the female process of gametogenesis.


What are the name of the cells produced from oogenesis?

Oogenesis is the process by which the female gamete cells are produced: these 'egg' cells are known as oocytes.


Formation of egg cells?

oogenesis


What does oogenesis produce?

mature ovum


Meiosis to form an egg?

Oogenesis