Actually, the main biology majors at UCB are effectively open majors (2.0 GPA needed) within the College of Letters and Science (to which all students enter as undeclared):
http://mcb.berkeley.edu/undergrad/major/major/declaring
http://ib.berkeley.edu/undergrad/major/declaring.php
For UCI, it looks like some biological science majors are impacted, but others are not, based on GPA requirements to change into them:
http://www.changeofmajor.uci.edu/CoM_BioSci.html
For UCSD, all biological science majors are impacted. Currently, admission to those majors for already-enrolled students is on a first come first served basis, but may change in the future.
https://biology.ucsd.edu/education/undergrad/admission/capped-major.html
Did not find any specific information for UCD or UCLA on a quick look.