In animals cellualar totipotency has been restricted only to

Options

A. Germinal cells
B. Epithelia cells
C. Zygote
D. Zygote and ealry blastomeres

Answer

To solve the question "In animals, cellular totipotency has been restricted only to," we will analyze the options provided and understand the concept of totipotency in cellular biology.

### Step-by-Step Solution:

1. **Understanding Totipotency**:
- Totipotency refers to the ability of a single cell to develop into a complete organism. This means that a totipotent cell can give rise to all cell types, including both embryonic and extra-embryonic tissues.

2. **Identifying Totipotent Cells in Animals**:
- In animals, the only cells that exhibit totipotency are the zygote and the early blastomeres (the cells formed after the zygote divides). These cells can develop into a full organism.

3. **Analyzing the Options**:
- **A. Germinal cells**: These are involved in the formation of gametes but are not totipotent.
- **B. Epithelial cells**: These are differentiated cells that have specific functions and are not totipotent.
- **C. Zygote**: This is indeed a totipotent cell as it can develop into a complete organism.
- **D. Zygote and early blastomeres**: This option includes both the zygote and the early cells that result from its division, which are also totipotent.

4. **Conclusion**:
- The correct answer is **D. Zygote and early blastomeres**, as these are the only cells in animals that retain totipotency.

### Final Answer:
**D. Zygote and early blastomeres**

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