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Spermatogenesis and oogenesis are two distinct processes of gametogenesis in sexually reproducing organisms, but they differ in their timing, mechanism, and outcome. Spermatogenesis occurs in the testes of males and begins at puberty, continuing throughout life. It involves the division of a diploid spermatogonium by mitosis, producing primary spermatocytes. These undergo meiosis I to form two haploid secondary spermatocytes, which then complete meiosis II ________ _____ _________ ____ ________ ______ ______ ____.
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