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An oogonium (pl.: oogonia) is a small diploid cell which, upon maturation, forms a primordial follicle in a female fetus or the female (haploid or diploid) gametangium of certain thallophytes. In the mammalian fetus
Oogonium are the stem cells for oocytes, and were previously thought to be depleted during development during the production of the primary oocytes. [1] However, some of these stem cells have been found in the mouse and primate ovaries.
The primary oocyte is defined by its process of ootidogenesis, which is meiosis. [2] It has duplicated its DNA, so that each chromosome has two chromatids, i.e. 92 chromatids all in all (4C).
By definition it means, to recapitulate mammalian oogenesis and producing fertilizable oocytes in vitro.it is a complex process involving several different cell types, precise follicular cell-oocyte reciprocal interactions, a variety of nutrients and combinations of cytokines, and precise growth factors and hormones depending on the ...
Definitions differ in where this shift occurs in the staging given above, with some stating that it occurs when entering the secondary stage, [2] and others stating that it occurs when entering the tertiary stage. [3] Until the preovulatory stage, the follicle contains a primary oocyte that is arrested in prophase of meiosis I.
Gonocytes are described as large and spherical, with a prominent nucleus and two nucleoli. [1] The term, gonocyte, was created in 1957 by Canadian scientists Yves Clermont and Bernard Perey. [2]
Oogonium (larger) and antheridium (with red centre) of the alga Chara, produced on the stem of a plant Magnified view of developing antheridia in Hypnum cupressiforme "Moss flowers": each shoot has a cluster of antheridia, i.e., an androecium.
A nonmotile female gamete formed in the oogonium of some algae, fungi, oomycetes, or bryophytes is an oosphere. [2] When fertilized, the oosphere becomes the oospore. [clarification needed] When egg and sperm fuse during fertilisation, a diploid cell (the zygote) is formed, which rapidly grows into a new organism.