The number of ova formed through oogenesis from each ovarian follicle is equal to

Options

A. The number of polar bodies
B. The number of primary oocyte
C. The number of secondary oocytes
D. Both 2 & 3

Answer

To solve the question regarding the number of ova formed through oogenesis from each ovarian follicle, we can break down the process step by step.

### Step-by-Step Solution:

1. **Understanding Oogenesis**:
- Oogenesis is the process of formation of ova (female gametes) in the ovaries. It begins during embryonic development and involves several stages of cell division.

**Hint**: Remember that oogenesis is specifically the formation of female gametes.

2. **Formation of Oogonia**:
- During embryonic development, oogonia (the initial germ cells) are formed. These cells undergo mitosis to increase in number.

**Hint**: Oogonia are the precursor cells to oocytes.

3. **Primary Oocyte Formation**:
- Oogonia develop into primary oocytes, which are arrested in prophase I of meiosis. Each primary oocyte will eventually undergo meiosis.

**Hint**: Focus on the transition from oogonia to primary oocytes.

4. **Meiosis in Oogenesis**:
- When a primary oocyte resumes meiosis, it undergoes the first meiotic division. This division is unequal, resulting in one secondary oocyte and one polar body.

**Hint**: Remember that the first meiotic division produces one functional gamete and one non-functional polar body.

5. **Second Meiotic Division**:
- The secondary oocyte will undergo the second meiotic division only if fertilization occurs. If it does, it will produce one ovum and another polar body. If it does not, it will be expelled during menstruation.

**Hint**: The second meiotic division is crucial for the formation of the mature ovum.

6. **Counting the Result**:
- From one primary oocyte, you ultimately get one ovum and three polar bodies (one from the first meiotic division and two from the second meiotic division of the polar bodies).

**Hint**: Keep track of the numbers: 1 ovum and 3 polar bodies.

7. **Conclusion**:
- Therefore, the number of ova formed through oogenesis from each ovarian follicle is equal to **one**. The options provided in the question suggest that the correct answer is that the number of ova formed is equivalent to the number of secondary oocytes, which is also one.

**Hint**: The key takeaway is that from each ovarian follicle, only one ovum is produced.

### Final Answer:
The number of ova formed through oogenesis from each ovarian follicle is equal to **one** (option D: both secondary and primary oocytes).