Figure 1: Map from Arthur Mourant’s The Distribution of the Human Blood Groups (Oxford: Blackwell Scientific Publications, 1954). The map shows the percentage of individuals carrying a particular blood-group allele in different regions of the world. Mourant’s intention was to offer a narrative about the migrationary history of human populations. For him, blood-group genetic variation offered “objective criteria” for studying human diversity that were “far removed from the traditional marks of ‘race’.”