Which of the following are examples of transgenic organisms?

With respect to understanding 'diseases', discuss the importance of transgenic animal models.

Which of the following correctly defines a transgenic animal?

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?

Transgenic models do not exist for which of the following diseases?

About what percentage of all existing transgenic animals are mice?