Which of these is incorrect about oogenesis?

Options

A. Meiosis-I is an unequal division
B. Menopause occurs around 50 years of age
C. It starts at puberty
D. Polar bodies are formed.

Answer

To determine which statement about oogenesis is incorrect, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding Oogenesis**:
- Oogenesis is the process of forming mature ova (eggs) from primordial germ cells (oogonia). It is a crucial part of the female reproductive system.

2. **Analyzing the Statements**:
- **Statement 1**: "Meiosis one is an unequal division."
- **Explanation**: In oogenesis, meiosis I results in an unequal division where one large secondary oocyte and a smaller polar body are formed. This statement is **correct**.

- **Statement 2**: "Menopause occurs around 50 years of age."
- **Explanation**: Menopause is indeed the cessation of the menstrual cycle and typically occurs around the age of 50. This statement is also **correct**.

- **Statement 3**: "It starts at puberty."
- **Explanation**: Oogenesis begins before birth when oogonia undergo mitosis to become primary oocytes, which then enter prophase I and remain arrested until puberty. At puberty, meiosis resumes, but the process of oogenesis itself starts before birth. Therefore, this statement is **incorrect**.

- **Statement 4**: "Polar bodies are formed."
- **Explanation**: During oogenesis, polar bodies are indeed formed as a result of the unequal divisions during meiosis. This statement is **correct**.

3. **Conclusion**:
- The incorrect statement about oogenesis is **"It starts at puberty."**

### Final Answer:
The incorrect statement about oogenesis is: **"It starts at puberty."**

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