A member asked:

I have an "a" blood type, my brothers and sisters have the same type "o" blood type, is that possible?

11 doctors weighed in across 2 answers

Yes: Yes it is. Your blood type a is because on of your parents was type a and the other type o. Your siblings happened to get the recessive o allele from the type a parent and o from the other. You got the a allele from the a parent making you a. It's totally possible.

Answered 4/19/2019

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Yes: Yes, that is possible. A is dominant so it is possible for your siblings to be type o with the same mother and father.

Answered 2/6/2012

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