O and A are, yes, but Rh negative blood isn't.
Rh negative blood is essentially non-existent outside of Europe, a little slice of North Africa, a slice of Israel, and parts of the New World.
Within Europe, it's highest concentration is in the Basque country, with Ireland a close second and Wales and Brittany behind them. Interestingly, there is NOT much of a concentration in the intermediate lands, nor in surrounding Spain, France, Italy, Germany or further East. Not much in England or Scotland, but a lot in Ireland and Wales. (Essentially, this tells us that the trait arrived by boat, and gives a strong boost to the ancient Irish "Milesian" legend, which said that the Irish actually sailed from what is now Spain in a fleet commanded by a leader named Miletus. If that sailing were from the Basque country, it follows a straight line across the Bay of Biscay to Brittany, Wales and Ireland, bypassing everything else.
But then you've got that outcropping of negative blood among a certain Berber tribe in the Atlas Mountains (only), and it's practical non-existence elsewhere. Amongst the Jews is easier to fathom, given their pelerinations and intermarriage over the centuries. Still, it's a RECESSIVE trait, which gives pause.
Anyway, it's a queer thing.
Oppenheimer says that the DNA of the British is ancient, 85% of the Brit's DNA arrived as early as 12k years ago. Now, 9,000 year old, Cheddar Man's (found in the UK) DNA is U5 which is the dominant line of the Sa'ami.