Taken directly from MIT's official website (https://biology.mit.edu/graduate/why-mit-biology/diversity-in-the-graduate-program/😞
Students enroll in the PhD program following three stages in the admissions process. Most applications from domestic applicants are read by at least three faculty members, and the top ~25% are discussed by a committee of 22 faculty members with extensive experience in graduate education. Based on this evaluation, students are invited to interview in-person. About 20% of domestic applicants are interviewed. Among all interviewed students, approximately 80% are admitted and 45% of those matriculate in the program. Note that the selection process for international students includes additional screening steps, because we receive a large number of applications for a small number of funded positions.