Thank you for the heads up, This is an important one for myself. They say... That type O blood came from evolutionary resistance to Malaria. The incredible thing is that when looking at a map of ancient blood types, Type O is almost exclusive to South America at 99% with a small swath of 99% through North America that originated on the West coast and spread East. Almost none at all in the other “origin” Continents. Only one small location in Northern New Zealand. How could that be?
It happened because it happened, and nothing to do with evolutionary resistance. The genome is mostly stable but slowly altered via copying errors. Natural selection is a search for “must be the reason”, and IMHO just 19th century secular superstition.
OTOH, it’s long been known that a single gene (one from one parent) for sickle cell protects against malaria, while two genes (one from each parent) is no freakin’ good, and actually makes carriers more susceptible to the effects of malaria.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3499995/
sidebars:
https://dnalc.cshl.edu/view/15404-Chromosome-9-gene-for-blood-group-Matt-Ridley.html
https://freerepublic.com/focus/chat/3993910/posts?page=5#5