The force of internal migration toward national genetic homo' geneity is seen in a cohort of 8850 British women who were ABO and Rh (+ or —) typed and located by residence in one of 40 county or county- group areas in England, Scotland and Wales in 1958 and again in 1974. The dines of phenotype frequencies of types O, A, B + AB and Rh— were plotted by polynomial regression on easting (longitude) and northing (latitude) and show a persistent heterogeneity but with statistically significant inter-regional shifts that account for the slightly flatter clinal curves for some of the geographic distributions after 16 years.
Mascie-Taylor, C G.N and Lasker, G W.
"Migration and Changes in ABO and Rh Blood Group Clines in Britain,"
2, Article 14.
Available at: https://digitalcommons.wayne.edu/humbiol/vol59/iss2/14