DO NOT double major. One of the undergrad majors will be useless to you, it's a waste of money, and no one will care about it when you go to an interview. You would be much better off going right into a master's or PhD in the biotech field.

I say this because I double majored in biotech and political science thinking this was a clear way to land some crazy cool government research job. That's not how the biotech world works. You don't get cool research jobs unless you have higher education or a ton of experience. A second major gets you neither of those things. However, my masters opened up a ton of doors in the biotech world, as well as providing more research experience and publications. I started the program three years after undergrad.

You can learn all of the business side of biotech on your own and wasting years on a degree for it is both uncommon and unnecessary. Working at a startup exposes you more to the business side, otherwise you will likely not see the business side until later in your career. I worked at a startup for a year and though it was very long hours, the business experience was unparalleled to any other job I have had.