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Oogenesis (/ ˌ oʊ. ə ˈ dʒ ɛ n ɪ s ɪ s /) or ovogenesis is the differentiation of the ovum (egg cell) into a cell competent to further develop when fertilized. [1] It is developed from the primary oocyte by maturation.
Gametogenesis, the development of diploid germ cells into either haploid eggs or sperm (respectively oogenesis and spermatogenesis) is different for each species but the general stages are similar. Oogenesis and spermatogenesis have many features in common, they both involve: Meiosis; Extensive morphological differentiation
Oogenesis and embryonic development [ edit ] Endoreduplication is commonly observed in cells responsible for the nourishment and protection of oocytes and embryos .
An immature ovum is a cell that goes through the process of oogenesis to become an ovum. It can be an oogonium , an oocyte , or an ootid . An oocyte, in turn, can be either primary or secondary, depending on how far it has come in its process of meiosis .
In mammals, oogenesis is believed to be primarily prenatal. The existence of oogonial stem cells in mammals is controversial, [ 7 ] except for the finding of OSCs in two species of loris [ 8 ] [ 9 ] and three species of bat.
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This is an accepted version of this page This is the latest accepted revision, reviewed on 10 February 2025. Procreative biological processes of humanity Part of a series on Sex Biological terms Sexual dimorphism Sexual differentiation Feminization Virilization Sex-determination system XY XO ZW ZO Temperature-dependent Haplodiploidy Heterogametic sex Homogametic sex Sex chromosome X chromosome ...
Summary of the main patterns of yolk accumulation and cleavage in animal embryology (after [6] and [7]).; I. Holoblastic (complete) cleavage II. Meroblastic (incomplete) cleavage