What is spermatogenesis? Briefly describe the process of spermatogenesis.

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Spermatogenesis is the process of the production of sperms from the immature germ cells in males. It takes place in seminiferous tubules present inside the testes. During spermatogenesis, a diploid spermatogonium (male germ cell increases its size to form a diploid primary spermatocyte. This diploid primary spermatocyte undergoes first meiotic division (meiosis $I$) which is a reductional division to form two equal haploid secondary spermatocytes. Each secondary spermatocyte then undergoes second meiotic division (meiosis $II$) to form two equal haploid spermatids. Hence, a diploid spermatogonium produces four haploid spermatids. These sper atids are transformed into spermatozoa (sperm) by the process called spermiogenesis. (figure)

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  • [AIIMS 2005]