Final answer:
When a woman's cell produces gametes, only one viable egg cell is produced through the process of oogenesis.
Step-by-step explanation:
When a woman's cell produces gametes, only one viable egg cell is produced in the process of oogenesis. Oogenesis is the development of haploid cells into mature eggs capable of fertilization. Meiosis results in the production of four haploid cells, but only one survives to become a mature egg. The other cells produced during oogenesis either degenerate or fail to complete meiosis.