Be careful here. Note that the lowest GPA subject at UCB is Biology, but the only courses under that subject are the introductory general biology courses*; there are no upper division courses under that subject (upper division biology courses are mostly under Molecular and Cell Biology or Integrative Biology). Some of the other lower GPA subjects are those which have large lower division enrollments by students of other majors. The highest GPA subject is Filipino, but the courses under that subject are various level language courses (including special versions for heritage speakers); presumably, there is a self-selection aspect here. That web site would be more useful if it allowed looking at lower division and upper division courses separately.
http://guide.berkeley.edu/courses/biology/
http://guide.berkeley.edu/courses/filipn/
*UCB Biology 1A, 1AL, and 1B seem to be bad news for pre-meds, since only 24% of the grades in those courses were pre-med-acceptable (A- or higher).