Which animals were the first to be developed for vaccine safety testing?

Choose the correct statement with reference to 'Dolly':

Transgenic animals are produced for which of the following purposes?
$I$. To study the normal physiology and development
$II$. To study diseases
$III$. To obtain useful biological products
$IV$. To test the vaccine safety
$V$. To test the chemical safety
Which of the above statements are correct?

Which of the following is not a use of transgenic animals?

Which gene was introduced in the first transgenic cow?

$A$ genetically modified organism,which is created by adding more than one gene,is known as a .......