All of the following are major differences between oogenesis and spermatogenesis EXCEPT

Options

A. oogenesis includes the formation of polar bodies
B. sperrnatogenesis is continuous throughout the male's reproductive years
C. oogenesis has long "resting" periods, in cotrast to spermatogensis
D. spermatogenesis produces gametic ceils, while oogenesis produces somatic celis

Answer

To solve the question regarding the major differences between oogenesis and spermatogenesis, we need to analyze each option provided and determine which one does not represent a significant difference between the two processes.

### Step-by-Step Solution:

1. **Understand Oogenesis and Spermatogenesis**:
- Oogenesis is the process of egg (ovum) formation in females.
- Spermatogenesis is the process of sperm formation in males.

2. **Analyze Option 1**:
- **Statement**: Oogenesis includes the formation of polar bodies.
- **Analysis**: This is true. In oogenesis, polar bodies are formed during the meiotic divisions. Thus, this is a valid difference.

3. **Analyze Option 2**:
- **Statement**: Spermatogenesis is continuous throughout the male reproductive years.
- **Analysis**: This is also true. Spermatogenesis begins at puberty and continues throughout a male's reproductive life. Hence, this is a valid difference.

4. **Analyze Option 3**:
- **Statement**: Oogenesis has long resting periods in contrast to spermatogenesis.
- **Analysis**: This statement is correct. Oogenesis involves long periods of inactivity (resting phases) whereas spermatogenesis is a continuous process. Thus, this is a valid difference.

5. **Analyze Option 4**:
- **Statement**: Spermatogenesis produces gamete cells while oogenesis produces somatic cells.
- **Analysis**: This statement is incorrect. Both spermatogenesis and oogenesis produce gametes (sperm and ova, respectively). Oogenesis does not produce somatic cells. Therefore, this option does not represent a major difference.

6. **Conclusion**:
- Since option 4 does not accurately describe a difference between oogenesis and spermatogenesis, it is the correct answer to the question.

### Final Answer:
The correct answer is **Option 4**: "Spermatogenesis produces gamete cells while oogenesis produces somatic cells."