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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 ...
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 ...
Contents. Germline. In biology and genetics, the germline is the population of a multicellular organism 's cells that develop into germ cells. In other words, they are the cells that form gametes (eggs and sperm), which can come together to form a zygote. They differentiate in the gonads from primordial germ cells into gametogonia, which ...
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 ...
[citation needed] The mutation frequency of female mouse germ line cells, like male germ line cells, is also lower than that of somatic cells. [49] Low germ line mutation frequency appears to be due, in part, to elevated levels of DNA repair enzymes that remove potentially mutagenic DNA damages. Enhanced genetic integrity may be a fundamental ...
Meiosis of primordial germ cells happens at the time of puberty, much later than in females. Tissues of the male testis suppress meiosis by degrading retinoic acid, proposed to be a stimulator of meiosis. This is overcome at puberty when cells within seminiferous tubules called Sertoli cells start making their own retinoic acid.
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.