Oogenesis
complete process of formation and maturation of an ovum or female gamete from a primordial female germ cell; examples of this process are found in Mus musculus and Drosophila melanomas
Oogenesis () or ovogenesis is female gametogenesis, the development of the egg cell (ovum) from the oogonium to a primary oocyte, and secondary oocyte. The egg cell is a cell that is competent to further develop when fertilized. Oogenesis is initiated during early embryonic development.
Stages
In humans and other mammals, the first part of oogenesis starts in the germinal epithelium, which gives rise to the development of ovarian follicles, the functional units of the ovary.
Oogenesis consists of several sub-processes: oocytogenesis, ootidogenesis, and finally maturation to form an egg cell. Folliculogenesis is a separate sub-process that accompanies and supports all three oogenetic sub-processes.
Oogonium —(Oocytogenesis)—> Primary Oocyte —(Meiosis I)—> First Polar body (Discarded afterward) + Secondary oocyte —(Meiosis II)—> Second Polar Body (Discarded afterward) + Ovum
Oocyte meiosis, important to all animal life cycles yet unlike all other instances of animal cell division, occurs completely without the aid of spindle-coordinating centrosomes.
The creation of oogonia
The creation of oogonia traditionally does not belong to oogenesis proper, but, instead, to the common process of gametogenesis, which, in the human female, begins with the processes of folliculogenesis, oocytogenesis, and ootidogenesis. Oogonia enter meiosis during embryonic development, becoming oocytes. Meiosis begins with DNA replication and meiotic crossing over.
This brief starts where responsible research should: with the source description of “Oogenesis” as complete process of formation and maturation of an ovum or female gamete from a primordial female germ cell; examples of this process are found in Mus musculus and Drosophila melanomas. Everything that follows is an evidence route, not borrowed authority.
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The subject matters to the general reference register because the source frames it as complete process of formation and maturation of an ovum or female gamete from a primordial female germ cell; examples of this process are found in Mus musculus and Drosophila melanomas. Its deeper value depends on whether names, dates, institutions and citations support that framing.
Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 13, 2026. The linked authority identifier is Q507032. The Library of Congress control number is sh85094847. 1 of 1 selected statements include explicit references; 0 carry qualifiers and 0 use preferred rank.
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This entry incorporates text from “Oogenesis” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.