An oocyte or ovocyte is a female gametocyte that divides twice by mitosis and meiosis into two other oocytes or into two ootids. Oocytes should not be confused with ova. A gametocyte is a eukaryotic germ cell that divides by mitosis into other gametocytes or by meiosis into gametes. ... Light micrograph of a newt lung cell in early anaphase of mitosis. ... In biology, meiosis is the process that transforms one diploid cell into four haploid cells in eukaryotes in order to redistribute the diploids cells genome. ... An ootid is a female gametid, as opposed to a male spermatid. ...
There are two types of oocytes: primary oocytes and secondary oocytes. A primary oocyte is just a kind of initial oocyte that is formed by mitosis of an oogonium into two primary oocytes. Each primary oocyte forms by meiosis two secondary oocytes, and each secondary oocyte divides into one ootid. An oogonium is a female gametogonium. ...
Each ootid, in turn, differentiates into an ovum Cellular differentiation is a concept from developmental biology describing the process by which cells acquire a type. The morphology of a cell may change dramatically during differentiation, but the genetic material remains the same, with few exceptions. ... A human ovum An ovum (loosely, egg or egg cell) is a female sex cell or gamete. ...
The formation of an oocyte is called oocytogenesis. Thus, oocytogenesis is a form of gametocytogenesis whose male counterpart is spermatocytogenesis. Gametocytogenesis is the creation of gametocytes by mitosis of gametogonia. ... Spermatocytogenesis is the male form of gametocytogenesis. ...
Primary oocytes in humans are found in the ovarian cortex and soon become surrounded by other ovarian cells to form primary non-fluid filled follicles.
In this situation, oocytes from another woman (the donor) are fertilized with the patients (the recipient) husbands sperm, and the resultant embryos are placed in the recipients uterus.
In general, stimulation of the oocyte donors cycle is brought about using a similar regimen of drugs that a woman using her own oocytes for in vitro fertilization-embryo transfer is commonly given.
As with oocyte donation, the best statistics occur when the embryos are transferred during a fresh cycle, requiring that the women and her gestational surrogate be synchronized as with oocyte donation.
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