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| Description: (a) In the process of spermatogenesis, male diploid (2n) germ cells undergo two meiotic divisions to produce mature haploid (n) sperm. (b) The characteristic head, midpiece, and tail of a mature human sperm, as seen in a drawing and the accompanying scanning electron micrograph (SEM). (c) The process of oogenesis in females, which produces a haploid secondary oocyte ready to be fertilized. (d) Mature oocyte. The drawing depicts a secondary oocyte within its follicle; the SEM shows an isolated human oocyte covered by its zona pellucida and remnants of the cumulus mass.
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