UCSD Admission

So if UCSD doesn’t admit by major, what happens when you get into the university but have a capped major (human bio) Will they reject you because of your major or are you undeclared science ?

If they accept you into the university but not your first choice (capped) major, hopefully you listed a second choice (uncapped) major. If they can’t offer you your 1st or 2nd choice, they will sometimes admit students as undeclared.