Can full sisters have different blood types?

There is also another possibility that the siblings may have different blood groups. ... For example, if you inherit a B allele from your father and an A allele from your mother, your blood type will be AB. ​ 1.Two O .... Our parents must have had all the connections needed to give all 6 children almost the full run of possibilities. read more

of course they can, it doesnt mean that if you dont have the same blood type as your siblings, your adopted or something. if your parent's blood types differ from each other there is a huge tendency that the sibling's blood types are different from each other. read more

In short, not accounting for Pos, and neg, if either parent has AB blood, none of their children will have O. To the other end, if one parent is A and the other B, the child can have any of the 4 blood types. Thus, siblings can have different blood types, despite having the same two parents. read more

The twist is that having A/B alleles will give you Type AB blood. It still follows the normal rules of inheritance, though. For your example above, though, it doesn't matter. So yes, it is possible for siblings to have different blood types. Exactly which blood types are possible depends on the parents. read more