Final answer:
During spermatogenesis, primary spermatocytes undergo meiosis I and meiosis II to become spermatids.
Step-by-step explanation:
The process of spermatogenesis involves the transformation of primary spermatocytes into spermatids. This occurs through two rounds of cell division known as meiosis I and meiosis II.
During meiosis I, each primary spermatocyte divides into two haploid secondary spermatocytes. These secondary spermatocytes then undergo meiosis II, resulting in the production of four haploid cells called spermatids.
The spermatids then undergo further changes, including the development of a flagellum, to become mature sperm cells capable of fertilizing an egg.