Spermatogenesis: spermatogonia ({{c1::2n}}) -> primary spermatocyte ({{c2::2n}}) -> secondary spermatocyte ({{c3::n}}) -> spermatid ({{c4::n}}) -> sperm.
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Spermatogenesis: spermatogonia (2n) -> primary spermatocyte (2n) -> secondary spermatocyte (n) -> spermatid (n) -> sperm.
Source: entermedschool.org