Again Google is your friend @SREE33.
Change of majors at UCI: http://changeofmajor.uci.edu/francisco-j-ayala-school-of-biological-sciences/
Change of majors at UCSD: https://biology.ucsd.edu/education/undergrad/admission/capped-major.html#Current-Biology-Majors
Changing Majors at UCLA College of L&S: CAN I CHANGE MY MAJOR?
A: Changing majors within the College of Letters and Science is usually not a problem. Talk to a counselor when you attend New Student Orientation, or visit the College when you begin to attend classes.