Name the first transgenic cow. Which gene was introduced in this cow?

Rosie is . . . . . . .

Transgenic animals are those in which ........ .

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?

The maximum number of existing transgenic animals is of:

Milk of transgenic cow '$Rosie$' was a nutritionally more balanced product for human babies than natural cow milk because it contained: