In the process of oogenesis, which leads to the formation of an egg cell, three tiny cells are produced: two polar bodies and one secondary oocyte. Here's the fate of each:

1. Polar Bodies:

- First Polar Body: During the first meiotic division of the primary oocyte, the cytoplasm and chromosomes are unevenly distributed, resulting in the formation of a small cell called the first polar body. It contains one set of chromosomes (haploid, n) and very little cytoplasm.

- Second Polar Body: During the second meiotic division of the secondary oocyte, another polar body is produced, known as the second polar body. It also contains one set of chromosomes (haploid, n) and limited cytoplasm.

Both the first and second polar bodies typically degenerate and disintegrate in the fallopian tube and do not play any further role in reproduction.

2. Secondary Oocyte:

- The secondary oocyte is the larger cell formed after the first meiotic division. It carries one set of chromosomes (haploid, n) and the majority of the cytoplasm and organelles from the primary oocyte.

- After the formation of the secondary oocyte, it undergoes a brief pause known as the metaphase II stage. Fertilization, the fusion of the secondary oocyte with a sperm cell, triggers the completion of meiosis, leading to the formation of a mature egg cell (zygote).

- If fertilization occurs, the zygote develops into an embryo and continues the process of embryonic development and organogenesis.

In summary, the two polar bodies eventually disintegrate, while the secondary oocyte either undergoes fertilization to become a zygote or degenerates if fertilization does not occur.