The events of spermatogenesis occur in the following order: mitosis of spermatogonia, differentiation into primary spermatocytes, formation of secondary spermatocytes, and formation of spermatids.
Mitosis of spermatogonia: Spermatogonia are the stem cells that give rise to all of the other cells involved in spermatogenesis. They undergo mitosis to produce more spermatogonia, as well as primary spermatocytes. Differentiation into primary spermatocytes: Primary spermatocytes are the first cells that differentiate from spermatogonia. They are produced through mitosis and are the precursors to secondary spermatocytes. Formation of secondary spermatocytes: Secondary spermatocytes are produced through meiosis, a type of cell division that reduces the number of chromosomes in the cell by half. This process produces cells with half the number of chromosomes as the original primary spermatocytes. Formation of spermatids: Spermatids are the final product of spermatogenesis. They are produced through a process called spermiogenesis, in which the secondary spermatocytes differentiate into spermatids. Spermatids are the precursors to sperm cells.
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