They deliberately made that black woman not a scientist, because they are racist.
They must have shopped far and wide to find a black woman so masculine and unappealing. She makes Whoppie Goldberg look like Audrey Hepburn. This may mean nothing when the jokes start, if they have a good script.
Actually, I was kinda surprised one of the scientists wasn’t Asian. If they wanted diversity accolades, they could have made the Black woman a scientist and the Asian woman the street-smart tag along.