**Step-by-Step Solution:**
1. **Understanding Cloning in Cattle**: Cloning involves creating a genetically identical copy of an organism. In cattle, this process often begins with a fertilized egg, which is an early stage of embryo development.
2. **Stages of Embryo Development**: After fertilization, the fertilized egg (zygote) undergoes several stages:
- **Zygote**: The initial stage immediately after fertilization.
- **Two-cell stage**: The zygote divides into two cells.
- **Four-cell stage**: The two cells divide again, resulting in four cells.
- **Eight-cell stage**: The four cells divide to form eight cells.
- **Morula**: After about 72 hours, the embryo forms a solid ball of cells known as the morula.
- **Blastocyst**: After about five days, the morula develops into a blastocyst, which is ready for implantation.
3. **Key Stage for Cloning**: The critical stage for cloning is the **eight-cell stage**. At this point, the cells are compact and ready for further development.
4. **In Vitro Fertilization and Cell Culture**: In the cloning process, the fertilized egg is often cultured in vitro (outside the body) until it reaches the eight-cell stage. At this stage, the cells can be separated and cultured to form small embryos.
5. **Implantation into Surrogate Mothers**: Once the small embryos are formed, they can be implanted into the wombs of other cows (surrogate mothers) to develop into calves.
6. **Evaluating Options**: The question provides several options regarding what happens to the fertilized egg:
- Option 1: Incorrect, as it suggests that up to 8 identical twins can be produced, which is not accurate.
- Option 2: Incorrect, as it states the egg is divided into 4 pairs of cells, which is misleading.
- Option 3: Correct, as it accurately describes that in the eight-cell stage, the cells are separated, cultured until small embryos are formed, and then implanted into the womb of other cows.
- Option 4: Incorrect, as it mentions the use of an electrical field, which is not a standard procedure in this context.
7. **Conclusion**: The correct answer is **Option 3**, as it accurately describes the process involved in cloning cattle.
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