oocyte
female egg before fertilization
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby ...
Oocyte
[Gr. oon - an egg; Gr. kytos - a hollow vessel, modern usage: cyt- denotes a cell]. A female germ cell that must undergo two meiotic divisions to become a mature ovum.
oocyte A cell that will/is undergo/ing development into a female gamete. PICTURE
oogenesis The production of ova. The development of a diploid cell into a haploid ovum or egg cell. PICTURE ...
oocyte
(o-uh-sight) [Gk. oion, egg + kytos, vessel]
A cell that gives rise by meiosis to an ovum.
oogamy ...
Oocyte (oh-oh-SITE) The developing female reproductive cell; an immature egg.
Organ A group of tissues that perform a particular job. Animals have more than a dozen organs, including the heart, brain, eye, liver, and lung.
primary oocyte
A diploid cell formed after a diploid oogonium underwent mitosis. The primary oocyte is arrested in Prophase of Meiosis I. It will complete meiosis to form a haploid primary oocyte and the haploid first polar body.
Oocytes can be unusually large cells in species for which embryonic development takes place away from the mother's body.
oocyte Stage in formation of ovum, just preceding first meiotic division (primary oocyte) or just following first meiotic division (secondary oocyte).
ooecium Brood pouch; compartment for developing embryos in ectoprocts.
Secondary oocytes are released at ovulation. The second meiotic division resumes after penetration by sperm.
In humans, secondary oocytes are fertilized. Eggs are produced only after fertilization of a secondary oocyte.
The primary oocyte grows much larger and completes the meiosis I, forming a large secondary oocyte and a small polar body that receives little more than one set of chromosomes.
Enucleated oocyte (cytoplast): An egg cell from which the nucleus has been removed mechanically.
The secondary oocyte passes into the oviduct (fallopian tube or uterine tube). The oviduct is connected to the uterus.
A sister cell of an oocyte in insects. Nurse cells produce the bulk of the cytoplasmic contents of the mature oocyte.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
Extracts from handisolated nuclear envelopes from frog oocytes were tested for the specific DNAbinding activity to (T2G4)116. A fragment of Tetrahymena telomere from a YAC plasmid was used as a labelled probe in a gelshift assay.
Capacitation is the final step in the maturation of mammalian spermatozoa and is required to render them competent to fertilize an oocyte. This step is a biochemical event; the sperm move normally and look mature prior to capacitation.
The oocytes of certain amphibians, however, have such large nuclei and such a density of pores that the nuclear envelope of one of the cells may contain more than ten million pores.
(Science: gynaecology) The discharge of a secondary oocyte from a vesicular follicle of the ovary. The expulsion of an ovum from the ovary (usually midway in the menstrual cycle).The formation of female [[gametes from the [[ ovarian follicle.
A laboratory procedure in which a cell's nucleus is removed and placed into an oocyte with its own nucleus removed so the genetic information from the donor nucleus controls the resulting cell. Such cells can be induced to form embryos.
cytoplasmic localization - a phenomenon wherein the morphogenetic determinants are found in a specific region of the oocyte and/or are later segregated to specific blastomeres.
Diploten (diplonema): The stage of meiosis I in which recombination between homologous chromosomes occurs. In females, oocytes are frozen at this stage at birth. Only one proceeds to the completion of meiosis every month during reproductive years.
In spermatogenesis, all four resulting cells form functional spermatocytes. In the female, in oögenesis, only one of the four becomes the functional oocyte. The other three cells are called polar bodies and are discarded.
 See also: Cell, Cells, Human, Organ, Animal
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