There are different reasons why some studies don’t hold water.
Especially the ones claiming to represent national data.
Nations are man-made.
Tribes are more organic.
A prime example:
What is the frequency of Rh negatives in Chile?
Do you know?
Sorry… this one is in English:
Some studies on Chile show frequencies below 1%, others more than 30%.
It is what happens when the highest Rh- population mixes with the lowest Rh- population.
Back to the Basques:
I like this study:
I am pretty sure you could probably find me a regional study with Rh- results as high as 44%, but I am not in the business of showing records, so for now, this conservative study suits just fine.
A 0.532 cde gene frequency for mostly Spain comes to 28.3024% Rh negatives among its Basque population.
Biarritz on the French side shows significantly lower frequencies with cde at 0.493 coming to 24.3049%.
This study shows also between 24 and 28% (more or less) frequencies, so I will go with that number.
Remember?
Basques are somewhat isolated, more in Spain than France, but not THAT isolated.
The Rh- frequencies go down continuously.
Yes, I have see studies close to 40% and others as “low” as 21%.
To make a long story short:
Among French Basques, around 24% are Rh- and around Spanish Basques 28%.
As for the Chilean Basques, the 33% Rh- frequencies from above listed study may seem surprising to some, but not me.