<P> However, before turning into gametogonia, the embryonic development of gametes is the same in males and females . </P> <P> Gametogonia are usually seen as the initial stage of gametogenesis . However, gametogonia are themselves successors of ((primoweranonymousment, primordial germ cells (PGCs) from the dorsal endoderm of the yolk sac migrate along the hindgut to the gonadal ridge . They multiply by mitosis, and, once they have reached the gonadal ridge in the late embryonic stage, are referred to as gametogonia . Once the germ cells have developed into gametogonia, they are no longer the same between males and females . </P> <P> From gametogonia, male and female gametes develop differently - males by spermatogenesis and females by oogenesis . However, by convention, the following pattern is common for both: </P> <Table> <Tr> <Td> Cell type </Td> <Td> ploidy / chromosomes in humans </Td> <Td> DNA copy number / chromatids in human </Td> <Td> Process </Td> </Tr> <Tr> <Td> gametogonium </Td> <Td> diploid (2N) / 46 </Td> <Td> 2C before replication, 4C after / 46 before, 46 X 2 after </Td> <Td> gametocytogenesis (mitosis) </Td> </Tr> <Tr> <Td> primary gametocyte </Td> <Td> diploid (2N) / 46 </Td> <Td> 2C before replication, 4C after / 46 before, 46 X 2 after </Td> <Td> gametidogenesis (meiosis I) </Td> </Tr> <Tr> <Td> secondary gametocyte </Td> <Td> haploid (N) / 23 </Td> <Td> 2C / 46 </Td> <Td> gametidogenesis (meiosis II) </Td> </Tr> <Tr> <Td> gametid </Td> <Td> haploid (N) / 23 </Td> <Td> C / 23 </Td> <Td> </Td> </Tr> <Tr> <Td> gamete </Td> <Td> haploid (N) / 23 </Td> <Td> C / 23 </Td> <Td> </Td> </Tr> </Table>

What are the names for the processes of forming eggs and sperm