Penn Pre Med (LSM/Wharton)

I am a rising junior and interested in the LSM program. If I was to get into Wharton but not LSM can I still do a major in the college of life sciences? My goal would to get a chemistry or bio degree and business degree so I can go to med school. Or are there other people that just get a Wharton degree and then take their pre med requirements with the Wharton degree? Thanks