Petition to take Life Science classes at UC Riverside

I am a transfer student at UCR majoring in Econ. Transfers are allowed to do life science courses along with their econ courses. However, my advisor will not allow me to do so because of unit cap. I want to petition and I was wondering if anyone can give me an example of a good petition that was accepted by UCR or any other UC.

Man, I know how you feel about the classes. I felt bummed out that I got barred from certain classes when I was registering as an incoming student.
My best guess would be to follow the advices here:
http://deanofstudents.ucr.edu/policiesprocedures/petitionsandappeals.html
Good luck.

How many units did transfer in with if you don’t mind me asking because I’m a 2nd year looking to pursue life science courses also!