Diane Eager On Blood Groups.

Diane Eager, a lecturer in BioMedical Sciences from The University of Canberra, explains the - rather complicated genetic reasons - why evolution of 4 different blood groups + variations is/was a non starter. Enjoy:

http://askjohnmackay.com/questions/answer/blood-groups-how-a-b-ab-o-rh-blood-groups-from-adam-eve