(a) why are transgenic animals so called?
(b) Explain the role of transgenic animals in (i) vaccine safety and (ii) biological products with the help of an example each

Explanation

Transgenic animals are called so as these animals posses the deliberate modification in their genome. The changes in the genome of the organisms are brought about by recombinat DNA technology.
Role of transgenic animal in vaccine safety-Transgenic mice are being developed for use in testing the safety of vaccines before they are used on humans.
Example-Transgenic mice are being used to test the safety of the polio vaccines. If successful and found to be reliable, they could replace the use of monkeys to test the safety of batches of the vaccine.
Role of transgenic animal in production of biological products-Transgenic cow, Rosie is used for the production of human protein-enriched milk, which contained Alpha lactalbumin and was nutritionally more suitable for human babies.