Question

11. In oogenesis, when do the primary oocyte, secondary oocyte, and ovum form? Which of these

are haploid cells?

12. In the ovarian cycle, what are the main events of the follicular phase? What are the main

hormones involved?

Answer 1

11. ANSWER -

PRIMARY OOCYTE(2n- diploid) - Forms in the fetal stage which are arreseted in the stage prophase-1.

SECONDARY OOCYTE (n- haploid) - first meotic division(complete prior to ovulation). This happens at puberty. Adult reproductive life.

OVUM ( n - haploid) -Ovulation- Mature graffian follicle ruptures and releases ovum (egg). Happens in adults mid month of menstrual cycle.

• Ovum and secondary oocytes are haploid. Because of reduction division (meosis).

12. ANSWER - FOLLICULAR PHASE / PROLIFERATIVE PHASE (1- 14 days of menstrual cycle)

• Slight Development in uterine walls.
• Ovarian events takes place.
• Pitiutary hirmone (LH & FSH) maintains.
• 1-4 days menses.
• Ovarian hormones : Estrogen increases prior to ovulation.
• Progesterone maintains the level.
• LH surge - sudden increase of this hormone happens when ovulation takes place not only LH but also FSH. LH is at peak at the time of ovulation.

HORMONES INVOLVED:

​​​​​​​LH- LUTEINISING HORMONE

FSH - FOLLICULAR STIMULATING HORMONE.

ESTROGEN

PROGESTRONE

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