oogenesis /oo·gen·e·sis/ (o″o-jen´ĕ-sis) the process of formation of female gametes (oocytes).oogenet´ic 
oogenesis
oogenesis
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Oogenesis, depicting only six of the 46 double-stranded chromosomes (oogonium, primary oocyte), three of the 23 double-stranded chromosomes (secondary oocyte, first polar body), and three of the 23 single-stranded chromosomes (second polar body, spermatozoon, and female and male pronuclei) in human oogenesis, and showing random assortment of homologous chromosome pairs. Crossing over, which may occur in meiosis I, has been omitted. Progression through meiosis II is only completed if fertilization occurs; the spermatozoon and male pronucleus are depicted out of scale for clarity.
o·o·gen·e·sis (   -j n  -ss)n. The formation and the development of the ovum. Also called ovigenesis. o o·ge·netic (-j-ntk) adj. |
oogenesis
[ō′əjen′əsis]
Etymology: Gk, oon + genesis, origin
the formation of the female gametes, or ova. The female infant is born with the entire number of primary oocytes that will function throughout reproductive life. Only a fraction of these survive until puberty, and only a small percentage will be ovulated. Follicles containing the primary oocytes are found in varying stages of development in the ovary of the sexually mature woman. Egg and sperm formation differ considerably in the number and size of gametes resulting from gametogenesis, the total number of gametes produced in a lifetime, and the time sequence for the initiation of the meiotic divisions and the completion of the cycle. Also called ovogenesis. Compare spermatogenesis. See also gametogenesis, meiosis, menstrual cycle, ovulation. oogenetic, adj.
oogenesis
the development of mature ova from oogonia. See also avian oogenesis.
oogenesis
Embryology The process of ♀ gamete formation
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