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| Immature ovum | |
|---|---|
| Anatomical terminology |
An immature ovum is a cell that goes through the process of oogenesis to become an ovum. 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 |
| Ovum | haploid/23 | 1C |