Which of the following is responsible for division of fertilized egg :-

Options

A. Centrioles of ovum
B. Distal centriole of sperm
C. Karyomeres
D. Proximal centriole of sperm

Answer

To determine which of the following is responsible for the division of the fertilized egg, let's analyze the options step by step:

### Step 1: Understand the Role of Centrioles
- **Centrioles** are cellular structures that play a crucial role in cell division. They help in organizing the mitotic spindle during cell division.

### Step 2: Evaluate Option 1 - Centrioles of Ovum
- The first option states "centrioles of ovum."
- **Analysis**: The ovum (egg) does not contain centrioles. Centrioles are found in the sperm, not in the egg. Therefore, this option is incorrect.

### Step 3: Evaluate Option 2 - Distal Centriole of Sperm
- The second option refers to the "distal centriole of sperm."
- **Analysis**: The distal centriole serves as the basal body for the sperm flagellum and is not directly involved in the division of the fertilized egg. Thus, this option is also incorrect.

### Step 4: Evaluate Option 3 - Cariomers
- The third option mentions "cariomers."
- **Analysis**: Cariomers are vesicles related to chromosomes but do not play a direct role in the division of the fertilized egg. Therefore, this option is incorrect as well.

### Step 5: Evaluate Option 4 - Proximal Centriole of Sperm
- The fourth option is "proximal centriole of sperm."
- **Analysis**: The proximal centriole of the sperm is indeed involved in the process of fertilization and is responsible for organizing the microtubules that will form the mitotic spindle during the first division of the fertilized egg. This makes this option the correct answer.

### Conclusion
- The correct answer to the question "Which of the following is responsible for the division of the fertilized egg?" is **Option 4: Proximal Centriole of Sperm**.

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