The Distribution of the Human Blood Groups
A. E. Mourant's 1954 book assembled worldwide blood-group frequency data into a major reference work, linking serology, genetics and physical anthropology before the genomic era.
What the study did and found
A. E. Mourant's 1954 book The Distribution of the Human Blood Groups assembled blood-group frequency data that had been scattered across the scientific literature. The book covers ABO, Rhesus, MNSs, Lewis, P, Lutheran, Kell, Duffy and Kidd systems, together with related inherited traits such as phenylthiocarbamide tasting and sickle-cell trait. Geographic surveys covered Europe, sub-Saharan Africa, the Mediterranean, Asia, Indonesia and Australasia, and the Americas, with additional chapters on migrant and mixed populations. The second half addressed laboratory procedures and gene-frequency calculations and included about 1,700 references, blood-group maps and frequency tables. Later historical analysis described the book as drawing on blood-grouping results from roughly half a million people.
Why it is cited
The book remains a reference point because it consolidated a large body of early population-genetic evidence into one comparative source. Later research on population history in Britain cited Mourant's compilation when discussing earlier evidence on human population structure. Historical scholarship has also examined the book as an important example of how post-war researchers converted blood-group observations into population-genetic datasets.
The individual blood-group systems described by Mourant remain biologically real and medically important, but their use in population research has changed substantially. Molecular studies established the DNA basis of ABO and many other blood-group polymorphisms, and modern sequencing now identifies variation directly at the genomic level. This means phenotype-frequency maps from the 1950s are valuable historical datasets but are no longer the main tool for reconstructing population relationships. Later scholarship also emphasizes that older population categories reflected the sampling practices, institutions and social classifications available at the time, which limits how directly some historical comparisons should be interpreted.
The topic today
Blood-group genetics now sits within a much broader genomic framework. ABO remains one of the most intensively studied human polymorphic loci, with hundreds of characterized alleles and extensive sequence variation. For transfusion medicine, blood-group systems continue to be essential for compatibility and immunohematology. For population history, however, researchers can now use genome-wide markers, haplotypes and ancient DNA to examine ancestry and migration at far higher resolution than blood-group frequencies alone. Mourant's book therefore remains most useful as a historical synthesis of early human genetic variation and as evidence of how population genetics developed before the genomic era.