As per the NEET notification, the student need to have Biology as one of the subject in your 10+2. So if you have Biology as one of the subject in your 10+2 being elective won't matter, but you should have secured atleast 50% marks in Biology in order to be eligible along with the other eligibility conditions.

For more information regarding NEET admission, you can consider the link below:

https://medicine.careers360.com/exams/neet

I hope this helps. Wish you a great day!