<p>Declaring doesn’t do anything (except in that you define if you are entering the College of Engineering which is harder to gain acceptance). Most students enter into the College of Letters and Sciences (L&S) which includes all the biology majors. L&S ignores what you listed and brings you in as undeclared. You declare your major typically after your second year. </p>
<p>Majors have a set of classes that you must have taken prior to declaring. This means that you do not have a front end of general stuff and then a back end of the major, but instead the two are intermixed over your four years at UCB.</p>
<p>For the major of Integrative Biology, to use an example, these are the required courses. You can declare when you complete “a majority” of these - it used to be 6 of the 8 but the criteria is slightly looser now.</p>
<p>Math 16A - semester of Calculus
Chem 1A - semester of inorganic chemistry
Chem 3A - semester of organic chemistry
Chem 3AL - lab associated with 3A
Chem 3B - second semester of organic chemistry
Chem 3BL - lab associated with 3B
Bio 1A - semester of introductory biology
Bio 1AL - lab associated with 1A
Bio 1B - second semester of introductory biology
Physics 8A - first semester of introductory physics
Physics 8B - second semester of introductory physics</p>
<p>Completing the major involves taking another six courses in your final two years.</p>
<p>The UC system, Cal, and the college of L&S all have requirements you also must satisfy for the degree. Some are waived based on high school classes, AP scores, or community college stuff. These include things like foreign language, american history, american culture, reading/comprehension, and a minimum number of courses in various areas called the breadth requirements. </p>
<p>When you satisfy the classes for your major, the hodgepodge of requirements in the paragraph above, and take enough additional coursework to get to the minimum of 120 units, you have earned your degree.</p>
<p>As an entering freshman, you will attend a session called CalSO during the summer. It provides advising, an intro to the school, and helps you register for many of your first semester classes.</p>
<p>Basically, you start with the list of majors you might take, listing all the required courses for those. You sprinkle in the obligations like reading/comprehension and breadths, which gives you a set of candidates for your first semester. From that, you look drop classes that are already filled, those that conflict with each other for the day/time they are given, and come to your targets for registration. </p>
<p>Cal has an interesting system where you register for classes in batches - phase I for the first set, up to 10.5 units worth, then later in phase II you complete the course load for the semester. Since L&S has a minimum load of 13 units for a full time student (and a max of 20.5), you have to divide your classes into those for phase I and for phase II. You use the popularity/demand of the class to decide, along with the relative urgency for your situation. If you are sure of your intended major and the class is often filled quickly then that is a phase I priority. If it is a breadth but there are many possible classes and many future semesters in which to address the breadth, then it is a phase II class.</p>
<p>For a potential bio major, it doesn’t matter one bit whether you list yourself as bio or undeclared.</p>