Modern biology acknowledges phenotypic and genotypic differences between groups of people. These differences may be obvious, like skin color, or non-obvious, like a difference in allele frequency. None of these differences ''within'' the species are as significant as differences ''between'' species. | Modern biology acknowledges phenotypic and genotypic differences between groups of people. These differences may be obvious, like skin color, or non-obvious, like a difference in allele frequency. None of these differences ''within'' the species are as significant as differences ''between'' species. |