Question

Are females born with all of their primary oocytes?

Answer 1

Hint: The ovaries are tiny organs in the female pelvis that are around the size of your thumb and are two in number. They are linked to the uterus on both sides, near the fallopian tube opening. The female gamete cell, known as the oocyte, is found in the ovaries. The oocyte is sometimes referred to as an "egg" in non-medical language.

Complete answer:
The ovaries are bursting at the seams with follicles. The oocyte (also known as egg) matures in fluid-filled structures called follicles. Females are born with their whole lifetime supply of gametes, according to current knowledge. The normal female ovary contains about 1-2 million oocytes at birth (eggs). Females are unable to produce fresh eggs, and the overall number of eggs produced each month continues to decrease. Only approximately a quarter of a girl's lifetime total egg pool (about 300,000) remains by the time she reaches adolescence.
The whole egg supply of a female will be depleted over the next 30-40 years of her reproductive life. Although no one can determine with absolute precision how many eggs are left in the ovaries at any particular moment, most women's fertility (their capacity to have a child) begins to decline around the age of 37. When a woman reaches menopause, she has almost no eggs left.
Each ovary contains a huge number of immature, or primordial, eggs that must grow and mature every month. The eggs are kept in the ovary's follicles. A huge number of follicles and oocytes will be recruited during a woman's lifetime to begin the growth and maturation process.
The maturation of eggs takes approximately 14 days and can be separated into two phases. Many eggs, possibly up to 1000, begin to develop and mature at this time. To drive additional development, the second phase of development necessitates gonadal hormone stimulation.
Despite the fact that hundreds of eggs have begun to mature, during each menstrual cycle, only one egg will usually become dominant and mature to the point of ovulation and fertilisation.
The eggs/follicles that remain will wither and perish. The gonadal hormones required for the second phase of development are not produced by pre-pubertal girls.As a result, many of the eggs that have begun to grow will just wither away. The continuous drop in the female's overall egg pool from birth to menopause can be attributed to the enormous number of eggs used each month.

Note:
Oogenesis begins in the embryonic period. To generate oogonia, primitive germ cells begin to divide. After birth, no more oogonia are created. All of the oogonia have been transformed into primary oocytes and primary follicles by six months following birth. Oogonia multiply and produce primary oocytes (diploid). Primary oocytes enter meiotic division's prophase I and stay there until adolescence and ovulation.