We inherit the vast majority of these differences from our parents.īut DNA can change when cells copy their DNA. New blood types evolved from new mutationsįirst off, the genetic differences between you and me are very small. But since you asked specifically about mutations, that’s what I’m going to focus on for the rest of this article. While these other exceptions are rare, they’re a bit more likely to happen than mutation. ( Cis-AB blood type is another way to break the rules, but it won’t explain this scenario.) For example, chimerism and Bombay blood group could both explain two O parents having a non-O child. In fact, a child can get almost any kind of blood type if you consider the rule-breaking exceptions. And the odds of having a mutation in precisely the right spot to change your blood type … even more unlikely.īut it is technically possible for two O-type parents to have a child with A or B blood, and maybe even AB (although this is even more unlikely). Keep in mind, though, that mutations are very rare. New mutations - or changes in the DNA - are theoretically one way these kinds of uncommon scenarios can happen. Two O parents will get an O child nearly all of the time.īut as with anything in biology, there are occasional exceptions to this rule.
Theoretically yes, but it would be extremely rare.
