Answer :

Animals in which a foreign of DNA is incorporated so as to obtain desired products or to study its effects on the biological processes are called the transgenic animals.

- E.g. – in 1997, Rosie a cow has been made transgenic to produce α-lactalbumin rich milk (2.4g/L).

Animal models have been developed to provide α-1-antitrypsin used by humans for the treatment of emphysema.

- In Canada, gene for spider web has been isolated from spiders & was inserted into goat. The goat now produces spider webs along with milk.

Due to the great tensile strength & light weight these spider web fibres are used for the development of military uniforms & tennis rackets.

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