The draft accreditation standards for schools of education call for higher average high school GPAs for teacher training programs, specifically that the average GPA should be 3.0 or better. Will raising this standard have a disparate impact on minority students? I think not.
Here’s a table I made from Baccalaureate and Beyond that breaks down high school GPA’s by race.
One caveat: These are national numbers. I don’t know if there are particular teacher training programs with a clientele centered on minority students with low GPAs.