Yes, you can absolutely with certainty appy physical characteristics to certain groups with plenty if certainty to be scientifically correct. To infer otherwise is ridiculous. That is like saying you are going to breed two chihuahuas and have the outcome be a border collie. Not that humans are as genetically dissimilar as different breeds of dogs, but they are far enough apart that the genetic variation of two black people producing offspring has no chance of producing the same genetic match as two Asian people.
The labels you are using - they are a societal construct. Humans observe physical differences between beings, set parameters for different groups, and then give them labels.
"Black" and "white" people just don't exist. Society has to call them that.