Cleavage is found in

Options

A. Zygote
B. Eggs
C. Undivided cell
D. After gastrula stage

Answer

To solve the question "Cleavage is found in," we need to analyze the options provided and understand the concept of cleavage in developmental biology.

### Step-by-Step Solution:

1. **Understanding Cleavage**: Cleavage refers to the series of rapid cell divisions that occur after fertilization, leading to the formation of a multicellular embryo from a single-celled zygote. This process does not involve growth in size but rather the division of the zygote into smaller cells called blastomeres.

2. **Analyzing the Options**:
- **Option A: Zygote**: This is the fertilized egg, and it is indeed where cleavage begins. After fertilization, the zygote undergoes cleavage divisions.
- **Option B: Eggs**: While eggs are the starting point for fertilization, cleavage specifically refers to the divisions that occur after fertilization, not in the unfertilized egg itself.
- **Option C: Undivided cells**: This option does not apply because cleavage involves the division of cells. Undivided cells are not undergoing cleavage.
- **Option D: After Gastrula Stage**: The gastrula stage comes after cleavage has already occurred. Therefore, cleavage is not found at this stage.

3. **Conclusion**: Based on the understanding of cleavage and the analysis of the options, the correct answer is **Option A: Zygote**. Cleavage is found in the zygote as it begins the process of cell division after fertilization.

### Final Answer:
**Cleavage is found in A. Zygote.**