2 Bios and 2 Chems. Here's the excerpt from the calendar:
Transfer Applicants
Transfer applicants will be admitted to the B.H.Sc. (Honours) Program from other programs at McMaster and from other post-secondary institutions. The process will be competitive and will be based on the student's academic qualifications and a Supplementary Application. Enrolment is limited. Students interested in being considered for admission to Level II of the B.H.Sc. (Honours) Program must have completed the equivalent of six units of university Level I Biology and six units of university Level I Chemistry. A cumulative average of at least 10.0 (minimum overall average of A-) will be required for admission consideration.
Source:
http://registrar.mcmaster.ca /CALEN...13/pg1267.html