Arrange the following cells in correct sequence of oogenesis.

(A) Secondary oocyte
(B) Oogonia
(C) Primary oocyte
(D) Ovum

Choose the correct answer from the options given below:

(B), (C), (A), (D)

The correct answer is Option (1) → (B), (C), (A), (D)     

(B) Oogonia

(C) Primary oocyte

(A) Secondary oocyte

(D) Ovum

The process of formation of a mature female gamete is called oogenesis which is markedly different from spermatogenesis. Oogenesis is initiated during the embryonic development stage when a couple of million gamete mother cells (oogonia) are formed within each fetal ovary; no more oogonia are formed and added after birth. These cells start division and enter into prophase-I of the meiotic division and get temporarily arrested at that stage, called primary oocytes. Each primary oocyte then gets surrounded by a layer of granulosa cells and is called the primary follicle . A large number of these follicles degenerate during the phase from birth to puberty. Therefore, at puberty only 60,000-80,000 primary follicles are left in each ovary. The primary follicles get surrounded by more layers of granulosa cells and a new theca and are called secondary follicles.