Pattern of cleavage in egg of Frog is

Options

A. Meroblastic
B. Holoblastic unequal
C. Holoblastic equal
D. All the above.

Answer

### Step-by-Step Solution:

1. **Understanding the Egg Structure**:
- The frog's egg contains a large amount of yolk, which is crucial for its development. The yolk is unevenly distributed in the egg, creating two distinct regions known as the animal pole and the vegetal pole.

2. **Identifying the Poles**:
- The **animal pole** is where the nucleus and a smaller amount of yolk are located, while the **vegetal pole** contains a larger concentration of yolk. This distribution affects how the egg divides during cleavage.

3. **Defining Cleavage Types**:
- Cleavage refers to the series of rapid cell divisions that occur after fertilization. There are two main types of cleavage: **holoblastic** and **meroblastic**.
- **Holoblastic cleavage**: The entire egg divides completely.
- **Meroblastic cleavage**: Only a part of the egg divides due to the presence of a large yolk.

4. **Analyzing Frog Cleavage**:
- In the case of frogs, the presence of a large yolk leads to **holoblastic unequal cleavage**. This means that while the egg divides completely, the divisions are unequal due to the yolk's influence, resulting in larger cells at the vegetal pole and smaller cells at the animal pole.

5. **Eliminating Incorrect Options**:
- The option for **meroblastic cleavage** is incorrect because it refers to partial division, which does not occur in frog eggs.
- The option for **holoblastic equal cleavage** is also incorrect because it implies equal division, which is not the case in frog eggs.

6. **Conclusion**:
- The correct answer is **holoblastic unequal cleavage**, as this accurately describes the cleavage pattern in frog eggs.

### Final Answer:
The pattern of cleavage in the egg of the frog is **holoblastic unequal cleavage**.