An<unk>  is a cell that goes through the process of oogenesis to become an<unk> . It can be an oogonium, an oocyte, or an ootid. An oocyte, in turn, can be either primary or secondary, depending on how far it has come in its process of meiosis. Cell type ploidy/chromosomes chromatids Process Process completion Oogonium diploid/46 2C Oocytogenesis (mitosis) third trimester primary Oocyte diploid/46 4C Ootidogenesis (meiosis 1) (Folliculogenesis) -- polar body separated Dictyate in prophase I until ovulation secondary Oocyte haploid/23 2C Ootidogenesis (meiosis 2) -- polar body separated Halted in metaphase II until fertilization Ootid haploid/23 1C Maturation Minutes after fertilization<unk>  haploid/23 1C
Immature ovum
Blighted ovum
Anovulatory cycle
Cervical mucus plug
Ectopic decidua
Postpartum physiological changes
Fallopian tube obstruction
Cryptic pregnancy