Spermatogenesis, the process of sperm cell development in males, results in the formation of four viable sperm cells from each germ cell. This occurs through two rounds of meiotic division, where a single diploid germ cell ultimately gives rise to four haploid sperm cells.
On the other hand, oogenesis, the process of egg development in females, is quite different. During oogenesis, one diploid germ cell produces only one viable egg, or ovum, while the other three cells formed during meiosis are termed polar bodies. These polar bodies typically degenerate and do not contribute to reproduction.
In summary, spermatogenesis results in four gametes (sperm), while oogenesis produces one gamete (egg) from each germ cell.