text: biologically what separates different races? basicly is the dna structure of a black person for example different from a white person, what is the chemical formular or whaterver that makes people the color they are?, what seperates different skin colors in human beings? there is more genetic variation between some tribes in africa than there is between those of african descent and those of european.  all humans have the same dna structure. thus, no, the dna structure of a 'black' person is not different than that of 'white' person, they are essentially the same with minute variations. these are so minute in fact, that you and someone with the same skin color could have less biologically in common than you could have with someone of a different skin color.  skin color is determined by a relatively small set of genes.