Really depends on the genetic combination of the person.
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I live in a neighbourhood with a lot of White male Black female couples, some quarter Black kids actually look very or even fully White. it's not uncommon here to see fully Black grand-mothers with very White looking grand-children. Just yesterday I saw a Black old toilet with a fully White looking grand-child, her daughter was a Mulatta. Meanwhile, in the bus home I saw a Mudshark with 2 half-Nigger kids, an older girl and a younger boy, while the girl had a fully "sassy resting Black bitch" face, she had a light blonde afro and light eyes (as her ugly mudshark mother had blonde hair and blue eyes).
Genetic combination matters a lot with race mixing, some mixed race people actually do pass as one race.