Which of the following is responsible for division of fertilised egg?

Options

A. Centrioles of ovum
B. Mitochondria of sperm
C. Proximal centriole of sperm
D. Mitochondria of ovum

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which component is responsible for the division of the fertilized egg. This division is crucial for the development of the embryo.

2. **Identifying Key Components**: In the context of fertilization, we have two main components: the sperm and the ovum (egg). The sperm contains structures called centrioles, which play a significant role in the division process.

3. **Focusing on Centrioles**: The sperm has two types of centrioles: the distal centriole and the proximal centriole. The proximal centriole is particularly important for the division of the fertilized egg.

4. **Role of Proximal Centriole**: The proximal centriole is responsible for the formation of astral rays during the cleavage stage of the fertilized egg. These astral rays help organize the microtubules that are necessary for cell division.

5. **Formation of Microtubules**: Upon fertilization, the proximal centriole organizes microtubules in the center of the fertilized egg, which is essential for the formation of the mitotic apparatus.

6. **Conclusion**: Therefore, the proximal centriole of the sperm is responsible for the division of the fertilized egg, as it facilitates the formation of the structures needed for cell division.

7. **Final Answer**: The correct answer is the **proximal centriole of the sperm**.