Am i eligible for admissions

I had applied for TAG as a biological sciences major for UC Davis with a 3.60 GPA and had everything done and am finishing the chem series,and math series this fall but just started bio series this fall and was gonna finish in spring. However it doesn’t seem as if i will be able to pass bio 101A this fall. How will this effect my tag? If i drop bio 101A and take it in spring will my tag still be accepted or do i have to finish the series. Also do i have to have the bio series finished to transfer for normal admission as a biological sciences major or can i take it at Davis.