hey,

here are the some colleges in south zone offering biotechnology

1. guru nanak college, chennai

2. the new college, chennai

3. mohamed sathak college of arts and science, chennai

4. vels institute of science, technology and advanced studies , chennai

5. bishop heber college -[BHC], tamil nadu

6. Dr. GR damodaran college of science -[GRDCS] , coimbatore

7. hindusthan college of arts and science - [HICAS] , coimbatore

hope this helps!