Maximum number of existing transgenic animals is of

Options

A. fish
B. mice
C. cow
D. pig

Answer

**Step-by-Step Solution:**

1. **Understanding Transgenic Animals**: Begin by defining transgenic animals. Transgenic animals are those that have had a foreign gene deliberately inserted into their genome. This genetic alteration allows them to express new traits or characteristics.

2. **Identifying Common Transgenic Animals**: Recognize that various species have been genetically modified, but some are more prevalent than others. Common examples include mice, rats, rabbits, and livestock like cows and pigs.

3. **Focus on Research and Applications**: Emphasize the role of transgenic animals in research, particularly in medical and pharmaceutical fields. Transgenic mice are extensively used for testing drugs, vaccines, and studying diseases.

4. **Conclusion**: Based on the prevalence and application of transgenic animals in research, conclude that the maximum number of existing transgenic animals is indeed transgenic mice.

**Final Answer**: The maximum number of existing transgenic animals is transgenic mice.

---