In the embryo of clone Dolly sheep, the fusion is done between

Options

A. egg cell and nucleus less udder cell
B. nucleus less egg cell and udder cell
C. enucleated egg cell and nucleus of somatic udder cell
D. sperm cell and somatic cell

Answer

To answer the question regarding the fusion that occurred in the embryo of the cloned sheep, Dolly, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding Cloning**: Dolly the sheep was the first mammal to be cloned from an adult somatic cell. This process is known as somatic cell nuclear transfer (SCNT).

2. **Identifying the Cells Involved**: In the cloning process, two types of cells are primarily involved:
- An **enucleated egg cell**: This is an egg cell from which the nucleus has been removed.
- A **somatic cell**: In Dolly's case, this was an udder cell (specifically, a mammary gland cell).

3. **Fusion Process**: The cloning process involves the fusion of the nucleus from the somatic cell (udder cell) with the enucleated egg cell. The nucleus contains the genetic material that will direct the development of the embryo.

4. **Resulting Embryo**: After the fusion, the enucleated egg cell, now containing the nucleus of the udder cell, begins to divide and develop into an embryo, which ultimately leads to the birth of Dolly.

5. **Conclusion**: Therefore, the correct answer to the question is that the fusion is done between the **enucleated egg cell and the nucleus of the somatic udder cell**.

### Final Answer:
The fusion in the embryo of clone Dolly sheep is done between the **enucleated egg cell and the nucleus of the somatic udder cell**.

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