An organism which carries a foreign functional gene in its genome is termed transgenic organism.

Two application of Biotechnology are 

1. Treatment of diseases.

2. Production of genetically modified plants and animals.

It is a single stranded DNA or RNA, tagged with a radioactive molecule, which hybridises with the  complementary  DNA and aids in detection of specific DNA sequences  by autoradiagraphy.

Animals whose DNA has been manipulated to possess and express an extra/foreign gene, are known as transgenic animals.