Graduate students in the Biology PhD Option come with very diverse undergraduate preparation—majors in physics, chemistry, mathematics, or psychology, as well as in biology and its various branches. The aims of the graduate program are to provide, for each student, individual depth of experience and competence in a particular chosen major specialty; perception of the nature and logic of biology as a whole; sufficient strength in basic science to allow continued self-education after formal training has been completed and thus to keep in the forefront of changing fields; and the motivation to serve his or her field productively through a long career. In accordance with these aims, the graduate study program in biology includes the following parts: a) The major program, which is to provide the student with early and intense original research experience in a self-selected subject of biology, supplemented with advanced course work and independent study in this subject; b) A program of course work designed to provide well-rounded and integrated training in biology and the appropriate basic sciences, which is adjusted to special interests and needs. An individual program will be recommended to each student in a meeting with the student’s advisory committee.

Applicants are required to submit the application and supporting materials online prior to the posted deadline. Once the application has been submitted, you will not be able to modify supporting documents, so please proofread your materials thoroughly before submission. To successfully complete the online application process, you must: • Create a free account with CollegeNET to submit the application form online. • Include payment of the application fee or submit a fee waiver request. • Upload a Statement of Purpose. • Request GRE, TOEFL, and/or IELTS test scores to be sent directly to the California Institute of Technology (Institutional Code 4034). • Upload an official electronic copy of your transcripts or online grade reports issued by your college or university. Updated grade reports for terms in progress are not required. Students who have been admitted and plan to attend Caltech will be required to submit an official copy of all transcripts from the Registrar’s Office prior to enrollment. • Register three individuals from whom you will request letters of recommendation. • Upload a CV or Resume.