oocyte

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Related to Ovocyte: secondary oocyte, Oocyte maturation

oocyte

 [o´o-sīt]
an immature ovum; it is derived from an oogonium, and is called a primary oocyte prior to completion of the first maturation division, and a secondary oocyte between the first and second maturation division.

o·o·cyte

(ō'ō-sīt),
Female gamete or sex cell. When fertilized by a sperm, an oocyte is capable of developing into a new individual of the same species; during matuation, the oocyte, like the sperm, undergoes a halving of its chromosomal complement so that, at its union with the male gamete, the species number of chromosome (46 in humans) is maintained; yolk contained in the oocytes of different animal species varies greatly in amount and distribution, which influences the pattern of the cleavage divisions.
See also: egg, ovum.
Synonym(s): ovocyte
[G. ōon, egg, + kytos, a hollow (cell)]

oocyte

/oo·cyte/ (-sīt) the immature female reproductive cell prior to fertilization; derived from an oogonium. It is a primary o. prior to completion of the first maturation division, and a secondary o. in the period between the first and second maturation divisions .

oocyte

(ō′ə-sīt′)
n.
A diploid cell from which an egg or ovum develops by meiosis. A primary oocyte divides to produce a polar body and a secondary oocyte, which divides again to produce the ovum and another polar body.

oocyte

[ō′əsīt]
Etymology: Gk, oon + kytos, cell
a primordial or incompletely developed ovum.

oocyte

Egg Histology The female reproductive or germ cell. Cf Sperm.

o·o·cyte

(ō'ŏ-sīt)
The female sex cell. When fertilized by a sperm, a gamete or zygote is capable of developing into a new individual of the same species; during maturation, the oocyte, like the sperm, undergoes a halving of its chromosomal complement so that, at its union with the male gamete, the species number of chromosomes (46 in humans) is maintained; yolk contained in the oocyte (ova in nonhuman species) varies greatly in amount and distribution, which influences the pattern of the cleavage divisions. In nonhuman females, the term is ovum.
[G. ōon, egg, + kytos, a hollow (cell)]

oocyte

A cell in the OVARY that undergoes MEIOSIS to produce an OVUM. In meiosis the 46 chromosomes are reduced to half the normal number (HAPLOID), so that the full complement can be restored by a haploid contribution from the sperm. Primary oocytes develop in the ovaries of the fetus but only a fraction of these will ever give rise to OVULATION. Secondary oocytes divide to form the mature OVUM but the second maturation division occurs only after the ovum has been fertilized by a sperm.

oocyte

an early stage in GAMETO GENESIS of female animals, ‘primary’ oocytes being DIPLOID (1) and ‘secondary’ oocytes HAPLOID (1) having undergone the first meiotic division. Human females are born with the primary oocytes already formed, which may increase the risk of NONDISJUNCTION of chromosomes. See also DOWN'S SYNDROME.

o·o·cyte

(ō'ŏ-sīt)
Female gamete or sex cell.
[G. ōon, egg, + kytos, a hollow (cell)]

oocyte

an immature ovum; it is derived from an oogonium, and is called a primary oocyte prior to completion of the first maturation division, and a secondary oocyte between the first and second maturation division.
References in periodicals archive ?
2000) published the birth of a living clone by direct transference of a nucleus derived from pig fetal fibroblasts into enucleated ovocytes.
the interspecific cloning of this animal is practically impossible because of an insufficient number of ovocytes, as the female Panda produces only one or two ovocytes a year.
The characterization of an injuring inductive action over cells by physical/chemical stimuli may be demonstrated on several activation events occurring in: 1) ovocytes, in parthenogenesis, (13) and 2) tissues that are to be replaced in order to display a new tissue organization -modeling events- in the embryo and postembryo development, such as those proceeding to the transformational changes related to life cycles and to the repair/regeneration processes.
The mean diameter of ovocytes in the developed gonads for the fish in the various samples varied from 200 to 550 mm (Fig.
4] ovocytes per fish) means that, contrary to Etchevers (1974), fecundity is not likely to be useful in discriminating between stocks.
Une forte synthese d'ecdysteroides est notee pendant la derniere phase de la maturation des ovocytes terminaux chez S.
This presence means that the individual's mature ovocytes have already fertilized (Cruz & Hawkins 1998, Cruz 2000)* To define this size, a stereomicroscope was used to examine the interior of the capitulum of each specimen taken from samples collected during January 2007 to December 2007.
Ripe sperm and ova appear in the middle of the follicles, but the early stages such as spermatogonia, spermatocytes, and ovocytes fastened to the germinal epithelium dominate.