A spermatid changes it into a sperm cell is that meiosis occurs, making the sperm cell haploid.
Spermatogenesis is the procedure of sperm cell development. Rounded immature sperm cells experience successive mitotic and meiotic divisions (spermatocytogenesis) and a metamorphic change (spermiogenesis) to produce spermatozoa.
Thus, a spermatid changes it into a sperm cell is and meiosis occurs, making the sperm cell haploid.
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