Anti-Corruption Commission spokeswoman Phyllis Chikundura says Levi Nyagura of the University of Zimbabwe was arrested yesterday. He appears in court today on abuse of office charges.
Mugabe, whose husband resigned in November under pressure from the military, received a doctorate in 2014 amid allegations she did not study for it.
Former president Robert Mugabe was university chancellor. Chikundura says the university should provide the "paper trail" showing Grace Mugabe's registration and academic progression.
Sociology department lecturers say they have no records of Mugabe's work.