08-17-2021, 04:16 PM
Quote:Evidence suggests that A is the oldest of the three(ish) AB0 markers, with B and 0 coming later. 0 is actually generally a broken type A allele (gene variant) that can no longer code for a functioning enzyme.
See that makes sense.
A is the oldest, B is the second oldest, AB is the 3rd oldest, and I bet you O is the newest blood type which is why there are so many people who have it.
