Human Reproduction — BIOLOGY STD 12 Science — Question

Oogenesis : The process of formation of female gametes, ova from germinal epithelium is called oogenesis. Oogenesis occurs in graaffian follicle. In this process the number of chromosomes are reduced to half.
This process is divided into three phases. 
(a) Multiplication Phase : This phase is initiated during embryonic developmental stage. In females during the embryonic development, some of the germinal epithilial cell undergoes mitotic division and form germ cells called egg mother cells or oogonia. The egg mother cells oogonia are diploid (2n). The oogania undergoes mitotic division to form the primary oocytes. Each of these primary oocyte gets covered with layers of granulose cells and called primary follicle.
(b) Growth phase : The primary follicles gets surrounded by more layers of granulosa cells and a new and are then called secondary follicles. The secondary follicle soon changes into tertiary follicle and is filled by a fluid cavity, antrum.
(c) Maturation phase : In this phase, the primary oocyte within the tertiary follicle grows in size and undergoes first meiotic unequal division on to form a large haploid secondary oocyte and a haploidtiny polar body. The tertiary follicle further changes into the Graafian follicle, it is a mature follicle. The secondary occyte forms a membrance called zona pellucida surrounding it. The Graafian follicle ruptures to release the secondary oocyte from the ovary. On the time of fertilization when sperm enter into the secondary oocyte, secondary oocyte undergoes meiosis-II Resulted two cells are, one large sized ovum and another smaller haploid secondary body.

So, in a complete oogenesis process, one egg cell and three polar bodies are formed.