Question

Are primary oocytes haploid?

Answer 1

A female's ovaries hold all of the eggs she will ever generate when she is born. The eggs, on the other hand, do not begin to mature until she reaches adolescence. After menarche, a female's adult years are marked by the maturation of one egg per month until she reaches middle maturity.

Complete answer:
Primary oocytes are diploid cells, not haploid. In oogonia, they are formed by mitotic division. Meiosis I takes place in primary oocytes, resulting in haploid secondary oocytes, which then produce haploid ovum during meiosis II.
The process of generating eggs in the ovaries is known as oogenesis. Eggs are haploid cells, meaning they have half the number of chromosomes as other diploid cells in the body. In order for sexual reproduction to result in a diploid progeny, eggs, like sperm, must be haploid. Oogenesis, like spermatogenesis, is divided into multiple stages involving various cell types.
When an oogonium (with a diploid number of chromosomes) starts mitosis to create primary oocytes, oogenesis begins (also with the diploid number of chromosomes). Oogenesis occurs when a primary oocyte divides for the first time during meiosis to produce secondary oocytes with the same number of chromosomes as the primary oocyte. The Meiosis chapter has more information on meiosis. If a sperm fertilises a secondary oocyte, the second meiotic cell division occurs, resulting in a haploid ovum.

Type of Cell	Chromosome	Process
Oogonium	Diploid	Mitosis
Primary oocyte	Diploid	Meiosis 1
Secondary oocyte	Haploid	Meiosis 2
Ovum (mature egg)	Haploid	Fertilization

Note:-
Oogenesis starts with oogonia (singular: oogonium), or immature eggs that form in the ovaries before birth. Oogonia are diploid cells that are the male equivalent of spermatogonia. The ovaries contain roughly seven million oogonia by the fifth month of foetal development.