<P> In mammals, the first part of oogenesis starts in the germinal epithelium, which gives rise to the development of ovarian follicles, the functional unit of the ovary . </P> <P> Oogenesis consists of several sub-processes: oocytogenesis, ootidogenesis, and finally maturation to form an ovum (oogenesis proper). Folliculogenesis is a separate sub-process that accompanies and supports all three oogenetic sub-processes . </P> <Table> <Tr> <Td> Cell type </Td> <Td> ploidy / chromosomes </Td> <Td> chromatids </Td> <Td> Process </Td> <Td> Time of completion </Td> </Tr> <Tr> <Td> Oogonium </Td> <Td> diploid / 46 (2N) </Td> <Td> 2C </Td> <Td> Oocytogenesis (mitosis) </Td> <Td> Third trimester </Td> </Tr> <Tr> <Td> primary oocyte </Td> <Td> diploid / 46 (2N) </Td> <Td> 4C </Td> <Td> Ootidogenesis (meiosis I) (Folliculogenesis) </Td> <Td> Dictyate in prophase I for up to 50 years </Td> </Tr> <Tr> <Td> secondary oocyte </Td> <Td> haploid / 23 (1N) </Td> <Td> 2C </Td> <Td> Ootidogenesis (meiosis II) </Td> <Td> Halted in metaphase II until fertilization </Td> </Tr> <Tr> <Td> Ootid </Td> <Td> haploid / 23 (1N) </Td> <Td> 1C </Td> <Td> Ootidogenesis (meiosis II) </Td> <Td> Minutes after fertilization </Td> </Tr> <Tr> <Td> Ovum </Td> <Td> haploid / 23 (1N) </Td> <Td> 1C </Td> <Td> </Td> </Tr> </Table> <Tr> <Td> Cell type </Td> <Td> ploidy / chromosomes </Td> <Td> chromatids </Td> <Td> Process </Td> <Td> Time of completion </Td> </Tr>

When does oogenesis begin and end in females
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