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On his map, he shows an Rh-negative population in Chad, still living near the formerly enormous Chad lake.
Only part of this lake still exists on the spot where the boundaries of Chad, Niger, Nigeria and Cameroon meet.
But when we examine high percentages of rh negative people, the wisest approach would be to ignore national levels for the most part.
Here is why: We are all a mix of ancient tribes and the closer we get to the source of each tribe, the easier it becomes for us to pinpoint which genetic ancestry is mostly responsible for rh negative blood.
With Scotland not being an independent country, their high number of rh negatives impact the percentage.