<Tr> <Td> four spermatids </Td> <Td> haploid (N) / 23 </Td> <Td> C / 23 </Td> <Td> spermiogenesis </Td> </Tr> <Tr> <Td> four functional spermatozoids </Td> <Td> haploid (N) / 23 </Td> <Td> C / 23 </Td> <Td> spermiation </Td> </Tr> <P> Spermatocytogenesis is the male form of gametocytogenesis and results in the formation of spermatocytes possessing half the normal complement of genetic material . In spermatocytogenesis, a diploid spermatogonium, which resides in the basal compartment of the seminiferous tubules, divides mitotically, producing two diploid intermediate cells called primary spermatocytes . Each primary spermatocyte then moves into the adluminal compartment of the seminiferous tubules and duplicates its DNA and subsequently undergoes meiosis I to produce two haploid secondary spermatocytes, which will later divide once more into haploid spermatids . This division implicates sources of genetic variation, such as random inclusion of either parental chromosomes, and chromosomal crossover, to increase the genetic variability of the gamete . </P> <P> Each cell division from a spermatogonium to a spermatid is incomplete; the cells remain connected to one another by bridges of cytoplasm to allow synchronous development . It should also be noted that not all spermatogonia divide to produce spermatocytes; otherwise, the supply of spermatogonia would run out . Instead, spermatogonial stem cells divide mitotically to produce copies of themselves, ensuring a constant supply of spermatogonia to fuel spermatogenesis . </P>

These cells begin the second mitotic division in spermatogenesis
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