Just passing on this which may be of interest. DNA movement is very eye opening isn't it. I read another report a while ago which warned of bottlenecks giving false theories. Things like the Great Plague in Britain which knocked out one blood group while others survived having greater immunity.
The Black Plague is especially interesting from a perspective of the ABO blood groups, since Yersinia is a bacteria with a preference for individuals of specific ABO group, in this case, group O. (4,5)
The effects of ABO blood group on survival against most forms of epidemic illness is so distinct that a modern day map of the ABO blood group distribution in Europe closely parallels the locations of major epidemics, with higher densities of blood group A and lower frequencies of blood group O in areas historically known to have had long histories of repeated pandemics.
This programme is about how at last the different areas of expertise are starting to work together at last.