'Rosie',a transgenic cow,is known to produce a type of milk which has all the following characteristics,except:

Transgenic animals are used to study which of the following aspects of normal physiology and development?

Choose the correct statement with reference to "Dolly".

Assertion: Animals that have had their $\text{DNA}$ manipulated to possess and express an extra (foreign) gene are known as transgenic animals.
Reason: Transgenic animals are made that carry genes which make them less sensitive to toxic substances than non-transgenic animals.

The first transgenic cow produced human protein in its milk. Which protein was it?

$A$: Transgenic mice are being used to test the safety of the polio vaccine.
$R$: It could replace the use of monkeys to test the safety of batches of the vaccine.