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An oocyte (UK: / ˈoʊəsaɪt /, US: / ˈoʊoʊ -/), oöcyte, or ovocyte is a female gametocyte or germ cell involved in reproduction. In other words, it is an immature ovum, or egg cell. An oocyte is produced in a female fetus in the ovary during female gametogenesis. The female germ cells produce a primordial germ cell (PGC), which then ...
Oogenesis is the process of the production of egg cells that takes places in the ovaries. Oogenesis (/ ˌoʊ.əˈdʒɛnɪsɪs /) 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.
The egg cell or ovum (pl.: ova) is the female reproductive cell, or gamete, [ 1 ] in most anisogamous organisms (organisms that reproduce sexually with a larger, female gamete and a smaller, male one). The term is used when the female gamete is not capable of movement (non- motile). If the male gamete (sperm) is capable of movement, the type of ...
After female (XX) germ cells collect in the undifferentiated gonads, the up-regulation of Stra8 is required for germ cell differentiation into an oogonium and eventually enter meiosis. One major factor that contributes to the up-regulation of Stra8 , is the initiation of the β-Catenin signaling pathway via RSPO1, which is also responsible for ...
Germ cells produce gametes and are the only cells that can undergo meiosis as well as mitosis. Somatic cells are all the other cells that form the building blocks of the body and they only divide by mitosis. The lineage of germ cells is called the germline. Germ cell specification begins during cleavage in many animals or in the epiblast during ...
Anatomical terminology. [ edit on Wikidata] 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 . Cell type. ploidy / chromosomes.
Ovulation marks the end of the follicular phase of the ovarian cycle, and the start of the luteal phase. Ovulation is the release of egg cells from the ovaries as part of the ovarian cycle for most vertebrates. In women, this event occurs at the end of the follicular phase, when the ovarian follicles rupture and release the secondary oocyte ...
Obesity. Nondisjunction. References. Oocyte abnormalities. Oocytes are immature egg cells that develop to maturity within a follicle in the ovary. Oocyte abnormalities can occur due to several factors, including premature ovarian insufficiency (POI), other maturation abnormalities, maternal ageing, and mitochondrial abnormalities.