Question

Identify the stage of follicle where primary oocyte undergoes first meiotic division. Also mention the products of this division.

Hint:

Remember that the first meiotic division is completed just prior to ovulation in the tertiary follicle stage.

Answer 1

Step 1: Understanding the Concept:
Oogenesis is the process of formation of a mature female gamete. It involves unequal meiotic divisions occurring within specific stages of ovarian follicles.
Step 2: Detailed Explanation:
The primary oocyte within the tertiary follicle grows in size and completes its first meiotic division (Meiosis I).
This division is unequal, resulting in the formation of:
1. A large haploid secondary oocyte that retains the bulk of the nutrient-rich cytoplasm.
2. A tiny first polar body which usually degenerates.
The tertiary follicle then matures into the Graafian follicle.
Step 3: Final Answer:
Stage: Tertiary follicle.
Products: Secondary oocyte and first polar body.