What is oogenesis? Give a brief account of oogenesis.

The formation of eggs or ova in the ovary is referred to as oogenesis. In this process, a diploid oogonium or egg mother cell size increases, and it gets transformed into a diploid primary oocyte. The diploid primary oocyte after attaining full growth undergoes first meiotic division i.e., meiosis I or reductional division to form two unequal haploid daughter cells. A very smaller cell is known as the first polar body or polocyte, while the larger cell is known as the secondary oocyte which contains the nucleus and entire cytoplasm with the yolk. The secondary oocyte undergoes a second meiotic division i.e., meiosis II or equational division, giving rise to a second polar body and an ovum. Thus, A single haploid ovum is produced by a diploid oogonium and also two or three polar bodies are produced in the entire process of Oogenesis.