More than $95$ percent of all existing transgenic animals are $Y$.

Transgenic animals are those which have foreign

For how many of the following diseases are transgenic animal models available?
Cancer,Cystic fibrosis,Pneumonia,Rheumatoid arthritis,Typhoid,Alzheimer's,Malaria

Which of the following is used for the safety testing of the polio vaccine?

The most common transgenic animals are .......

Consider the following statements:
$I$. Transgenic animals are more sensitive to toxic substances than non-transgenic animals.
$II$. Useful biological products can be produced by introducing into transgenic animals the portion of $DNA$ which codes for a particular product.
$III$. Brazzein is a protein produced by a West African plant,$Pentadiplandra$ $brazzeana$,which is approximately $2000$ times as sweet as sugar.
Which of the statements given above are correct?