A zygote is completely divided into two by a cleavage furrow. The cleavage type is

Options

A. radial
B. equatorial
C. holoblastic
D. meroblastic

Answer

To determine the type of cleavage when a zygote is completely divided into two by a cleavage furrow, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Zygote Formation**:
- A zygote is formed when a male sperm fertilizes a female ovum (egg). This results in a single-celled organism known as a zygote.

2. **Defining Cleavage**:
- Cleavage refers to the series of mitotic divisions that a zygote undergoes to develop into an embryo. During this process, the zygote divides into smaller cells called blastomeres.

3. **Types of Cleavage**:
- There are two main types of cleavage:
- **Holoblastic Cleavage**: This occurs when the entire zygote divides completely into two separate cells. Each cell is surrounded by its own plasma membrane.
- **Meroblastic Cleavage**: In this type, only a part of the zygote divides, leaving a portion of the zygote undivided. This results in incomplete division.

4. **Identifying the Cleavage Type**:
- The question states that the zygote is completely divided into two by a cleavage furrow. This indicates that the entire zygote is undergoing division without any part remaining undivided.

5. **Conclusion**:
- Since the zygote is completely dividing into two, the type of cleavage being described is **holoblastic cleavage**.

### Final Answer:
The cleavage type is **holoblastic**.

---