Before I declare my major...
Thinking about being a bio major? That could be challenging but so much fun! There are so many different pathways or tracks that you can do as a bio major, so it is always good to think ahead. You have plenty of time at this point, try to explore as much as possible before making your final decision. Here we are trying to break down the major requirements and provide some references as you build your own planner.
First Year
The first year courses set the ground for courses that you can take in the following years - it's the best time to complete some of the prerequisites that would definitely be on your way.
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There aren't many biology courses offered for first year students due to the overlarge class size. Instead, students intending to major in bio always start with taking General Chemistry (CHEMH111-115) with lab in their first year. Chemistry and biology are intrinsically related, so understanding chemistry provides solid background for biology study. The whole year Gen Chem counts toward the bio major requirement - Chemistry with Lab.
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You can choose to take BIOL H115 or look up for bio courses at Bryn Mawr if you are strongly motivated, but you don't have to. Notably, the first year courses don't count toward bio major requirements. Leave some room for your exploration of any other fields!
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If you are considering of doing pre-med/engineer/scientific computing concentration, it is also recommended to take some math courses in your first year (most commonly MATH118 calculus and MATH121 multivariable calculus).
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Additionally, it's totally fine if you are not following the common pattern! It's never too late to change your mind and prepare for these. Just reach out to all the resources and ask for their advice of how to get onto the track asap!
Sophomore
Now you are stepping onto the core courses of biology - Bio200 and 201. Every bio major is required to 200 and 201, and they are the pre requisites of most 300 level bio electives. (So that means you can't take 200/201 and 300 electives simultaneously. )
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It is common for students to take organic chemistry (CHEM 222) at the same time since first semester orgo has an emphasis on biological conditions and reactions and it can be counted toward major requirement. The second semester orgo (CHEM 225) needs a decision. If you are 100% sure that you won't do pre-med/biochemistry concentration, it's ok if you decide not to take it because it's too chemistry heavy. But if you have ever hesitated about that, just take it and avoid limiting your choices at an early stage. It's also possible to take orgo in your junior year depending on your schedule, the choice is up to you!
Remember to keep in mind whatever pathway you are considering when making decision and planning courseworks out!