(a) What are transgenic animals ?
Name the transgenic animal having the largest number amongst all the existing transgenic animals.(c) Mention any three purposes for which these animals are produced.

Explanation

### Step-by-Step Solution:

**(a) What are transgenic animals?**

Transgenic animals are organisms whose DNA has been genetically modified to include one or more genes from another species. This manipulation allows them to express new traits or characteristics that are not naturally found in their species. The process typically involves inserting a foreign gene into the animal's genome, which can lead to the production of proteins or other substances that can be beneficial for research, agriculture, or medicine.

**(b) Name the transgenic animal having the largest number amongst all the existing transgenic animals.**

...