Emailed me for half an hour interview. Chat with a professor. Asked me five questions. Very causal. Told me they will make decision later, and told me I can contact the professor any time with questions.

For biology PhD program, it usually had 2 virtual screen calls followed by the open house in person interviews with 3 faculties. During the open house, there will be a student-led seminar presentations where a selected group of grad students volunteered to present their work.