Final answer:
After the S phase in meiosis, male cells undergo mitosis to form primary spermatocytes, while female cells undergo meiosis I to form secondary oocytes.
Step-by-step explanation:
In meiosis, after the S phase and prior to meiosis, male cells undergo mitosis to produce two diploid cells called primary spermatocytes. One of the primary spermatocytes goes on to produce sperm, while the other replenishes the reserve of spermatogonia. After meiosis I, the primary spermatocyte produces two haploid daughter cells called secondary spermatocytes.
On the other hand, female cells undergo meiosis I to produce one haploid daughter cell called the secondary oocyte. Meiosis II occurs after fertilization and produces an egg, or ovum, and a polar body. The egg is the mature female gamete which can be fertilized by sperm.