Meiosis - I is completed before coming out of oocyte from ovary and form?

Options

A. Secondary oocyte
B. Second polarbody
C. First polar body
D. Both 1 & 3

Answer

To answer the question regarding what is formed when Meiosis I is completed before the oocyte comes out of the ovary, we can break down the process of oogenesis step by step.

### Step-by-Step Solution:

1. **Understanding Oogenesis**: Oogenesis is the process of egg (oocyte) formation in females. It begins with primordial germ cells called oogonia.

2. **Mitosis of Oogonia**: The oogonia undergo mitosis to increase in number, resulting in primary oocytes. This step is crucial as it establishes the pool of cells that will eventually develop into eggs.

3. **Meiosis I Initiation**: The primary oocytes then enter the first meiotic division (Meiosis I). However, this division is not completed until just before ovulation.

4. **Completion of Meiosis I**: When Meiosis I is completed, it results in two cells:
- A larger cell known as the **secondary oocyte**.
- A smaller cell called the **first polar body**.

5. **Outcome of Meiosis I**: At this stage, the secondary oocyte is the cell that will be released from the ovary during ovulation, while the first polar body typically does not develop further and may degenerate.

6. **Conclusion**: Therefore, after the completion of Meiosis I, the two structures formed are the secondary oocyte and the first polar body. The question specifically asks what is formed when Meiosis I is completed before the oocyte leaves the ovary.

7. **Correct Answer**: The correct options are:
- **Secondary oocyte** (Option 1)
- **First polar body** (Option 3)
- Thus, the correct answer is **both 1 and 3** (Option D).