Oogenesis

• What is oogenesis?


  Oogenesis is the formation of the female sex cell or the female gamete.
• What are the two main events that occur during oogenesis?

  • Meiotic event (meiosis I and II)
  • Development of the follicle
• When does oogenesis begin?

  Oogenesis begins during the fetal stage.
• What is the primordial germ cell's role in oogenesis?

  The primordial germ cell undergoes mitosis to become the orgonium.
• What does the orgonium develop into?

  The orgonium develops and grows into a primary oocyte.
• What is the chromosome number in primordial germ cells, orgonia, and primary oocytes?

  All contain 46 chromosomes (2n).
• What happens to the primary oocyte during fetal development?

  The primary oocyte begins meiosis I but is stalled at prophase I.
• How many primary oocytes are produced during fetal development?

  About seven million primary oocytes are produced.
• What happens to the primary oocytes after birth?

  About six million primary oocytes undergo programmed cell death.
• How many primary oocytes remain by the time a female reaches puberty?

  About one million primary oocytes remain.
• What occurs to primary oocytes at puberty?

  Primary oocytes reduce to about three hundred thousand and continue to be stalled at prophase I.
• What happens to the primary oocyte after puberty?

  Prophase I continues and meiosis I is completed.
• What are the products of meiosis I in oogenesis?

  Two haploid cells are produced.
• What is the haploid number of chromosomes in human beings?

  The haploid number is 23 chromosomes.
• How do the two haploid cells produced from meiosis I differ?

  One is larger and known as the secondary oocyte, while the other is smaller and known as the first polar body.
• What happens to the secondary oocyte after meiosis I?

  The secondary oocyte begins meiosis II but is stalled at metaphase II.
• What is released during ovulation?


  The secondary oocyte is released during ovulation.
• What triggers the completion of meiosis II in the secondary oocyte?

  Meiosis II is completed when a sperm penetrates the secondary oocyte.
• What are the products of meiosis II in oogenesis?

  One ovum and one second polar body are produced.
• What happens to the first polar body?

  The first polar body may degenerate or undergo meiosis II to become two further polar bodies.
• What is the process of follicle development after birth?

  • Primary oocyte is surrounded by follicle cells.
  • Combination is known as the primary follicle.
  • At puberty, follicle stimulating hormone stimulates growth.
  • Primary follicle develops into secondary follicle.
  • Secondary follicle develops into graphene follicle.
• What is the primary follicle?

  The primary follicle is a primary oocyte surrounded by a layer of follicle cells.
• What happens to the follicle cells at puberty?


  Follicle stimulating hormone stimulates the growth of follicle cells.
• What is the antrum in the graphene follicle?

  The antrum is a region filled with liquid within the graphene follicle.
• What happens during ovulation?


  The secondary oocyte is released from the graphene follicle into the fallopian tubes.
• What is the corpus luteum?

  The corpus luteum is a bundle of cells that produces progesterone after ovulation.
• What happens to the follicles during the menstrual cycle?

  • Primary follicles are produced during fetal stage.
  • At birth, primary follicles reduce to one million.
  • At puberty, secondary follicles develop.
  • Secondary follicles develop into graphene follicles.
  • Graphene follicles release secondary oocytes during ovulation.
• What happens to the graphene follicle after ovulation?

  The follicle cells become the corpus luteum.
• What is the role of the corpus luteum?

  The corpus luteum is responsible for producing progesterone.
• What is suggested for further learning after studying oogenesis?

  It is suggested to watch spermatogenesis next.
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• Fertilization takes place within the fallopian tube or uterine tubes.
• Ovulation occurs when the follicle ruptures at its base, releasing the mature ovum into the peritoneal cavity.
• The oocyte is surrounded by the zona pellucida, which is secreted by granulosa cells.