Movement of blastomeres usually seen in which embryonic stage :-

Options

A. Morula
B. Blastula
C. Gastrula
D. In all embryonic stages

Answer

**Step-by-Step Solution:**

1. **Understanding Blastomeres**:
- Blastomeres are the cells formed by the cleavage of a fertilized egg (zygote). These cells are totipotent, meaning they have the potential to develop into any type of cell in the organism.

2. **Identifying Embryonic Stages**:
- The embryonic development progresses through several stages:
- **Zygote**: The fertilized egg.
- **Morula**: A solid ball of cells formed after several rounds of cleavage.
- **Blastula**: A hollow sphere of cells that forms after the morula stage.
- **Gastrula**: The stage where the three germ layers (ectoderm, mesoderm, and endoderm) are formed.

3. **Movement of Blastomeres**:
- The question specifically asks about the movement of blastomeres. This movement is associated with the rearrangement of cells during embryonic development.

4. **Analyzing Each Stage**:
- **Morula**: At this stage, the cells are still tightly packed and do not exhibit significant movement.
- **Blastula**: While the blastula is a hollow structure, there is limited movement of the cells.
- **Gastrula**: This stage is characterized by morphogenetic movements, where the cells (blastomeres) move to form the three germ layers. This is where significant movement occurs.

5. **Conclusion**:
- The movement of blastomeres is most prominently observed during the **Gastrula** stage, making it the correct answer.

**Final Answer**: The movement of blastomeres is usually seen in the **Gastrula** stage.

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