|Cell type||ploidy/chromosomes||chromatids||Process||Time of completion|
|Oogonium||diploid/46||2N||Oocytogenesis (mitosis)||third trimester|
|primary Oocyte||diploid/46||4N||Ootidogenesis (meiosis 1) (Folliculogenesis)||Dictyate in prophase I until ovulation|
|secondary Oocyte||haploid/23||2N||Ootidogenesis (meiosis 2)||Halted in metaphase II until fertilization|
|Ootid||haploid/23||1N||?||Minutes after fertilization|
The only normal human type of secondary oocyte has sex chromosomes 23,X (where sperm can be 23,X or 23,Y).
Mouse oocytes fertilised by ICSI during in vitro maturation retain the ability to be activated after refertilisation in metaphase II and can generate Ca.sup.2+ .sup.oscillations.(Research article)(intracytoplasmic sperm injection)(Clinical report)
Jun 20, 2007; Authors: Agnieszka J?drusik ; Anna Ajduk ; Pawe? Pomorski ; Marek Maleszewski (corresponding author) BackgroundIn all...
Oocyte maturation in the brachiopod Terebratalia transversa: role of follicle cell-oocyte attachments during ovulation and germinal vesicle breakdown.
Dec 01, 1997; Introduction In many groups of animals, Oocytes develop in close association with a surrounding sheath of follicle cells...
Oocyte cohort analysis: criteria for an evaluation of the reproductive cycle in Solen marginatus (pennant, 1777), (Bivalvia: Solenacea) in Southern Tunisia.(Report)
Apr 01, 2010; ABSTRACT The purpose of this study was to develop an Oocyte maturation scale and to retrace the development of the...