Where oogenesis does take place. Describe the stages of this process?
The process of formation & maturation of the ovum is called oogenesis. It takes place in the ovary & is initiated during the embryonic development of the female fetus. It consists of 3 phases:-- Multiplication phase:- Oogonia is produced when primordial germ cells split through meiosis. These oogonia divides lay repeated mitotic divisions forming clusters. In each cluster, only one of them enters into the growth phase & is called the primary oocyte. Growth phase:- Growth phase occurs only after attainment of puberty. It involves – increases in the size of the oocyte to many folds & synthesis of you. Maturation phase:- The first division is meiotic as a result two haploid (n) cells are produced. In this division, cytokinesis is unequal, a large daughter cell with almost all cytoplasm is called a secondary oocyte & a smaller me with less cytoplasm is called a polar body. The secondary oocyte then undergoes a second meiotic division to form an ovum & a second polar body.
