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12th Biology 2013 Set1 Delhi Board Paper Solution

Question 25

(a) Why are transgenic animals so called?
(b) Explain the role of transgenic animals in
(i) Vaccine safety
(ii) Biological products with the help of an example each.

Answer
(a) Transgenic animals are so called because they have their DNA manipulated. As a result they possess and express foreign gene.
 
(b) Role of in vaccine safety
 
Transgenic mice are being used to test the safety of the polio vaccine before they are used on humans.
 
Biological products
 
Medicines required to treat many human diseases contain certain biological products which are expensive to make. These products can be produced by transgenic animals by induction of genes in them which code for particular product e.g. human protein (alpha -1 - antitrypsin)