The first transgenic cow was developed in the year:

$A$: 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.

In transgenesis,the expression of the transgene in the target tissue is known as:

Match the following:

Column-$I$	Column-$II$
$(1)$ Study of disease	$(p)$ Transgenic mice
$(2)$ Biological products	$(q)$ Testing toxicity of drug
$(3)$ Vaccine safety	$(r)$ Rheumatoid arthritis
$(4)$ Chemical safety	$(s)$ $\alpha-1$ Antitrypsin

If a cattle is showing increased respiration and blood mixed foamy discharge from mouth,nose,and anus,it is likely to be suffering from

Why are transgenic animals produced?