Which type of cleavage occurs in the zygote of reptiles, birds and prototherians?

Explanation

To answer the question about the type of cleavage that occurs in the zygote of reptiles, birds, and prototherians, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding Cleavage**: Cleavage refers to the series of cell divisions that occur after fertilization, leading to the formation of a multicellular embryo. The type of cleavage can vary based on the amount and distribution of yolk in the egg.

2. **Types of Cleavage**: There are two main types of cleavage:
- **Holoblastic Cleavage**: This occurs in eggs with little yolk, where the entire egg is divided into smaller cells.
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