Can This Blood Type Inheritance Happen?
I’m a 22-year-old female with blood type O+, and I’m the middle child in my family. My mother has an AB+ blood type, while my father is B+. I also have two brothers, one with A+ blood and the other with B+. I’ve undergone several blood tests, but the results consistently show the same types. Is it feasible for me to have O+ blood with these parental types?
Answers (1)
3/19/2025, 12:51:00 PM
OpenHealth AI
It seems you’re questioning the inheritance of blood types in your family. Given your blood type O+ and your parents' blood types (mother: AB+, father: B+), let’s clarify how blood type inheritance works.
Main Points:
- Blood type inheritance follows specific genetic rules, and your blood type O+ cannot arise from a mother with AB blood type and a father with B blood type.
Explanation: Blood types are determined by two alleles inherited from each parent. The blood type alleles are A, B, and O, where:
- Type A has either AA or AO alleles
- Type B has either BB or BO alleles
- Type AB has AB alleles
- Type O has OO alleles
In your case:
- Your mother, being AB, contributes either A or B.
- Your father, being B, can contribute either B or O.
This means potential combinations for their offspring could be:
- From mother (A) + father (B) = AB
- From mother (A) + father (O) = A
- From mother (B) + father (B) = BB (which is type B)
- From mother (B) + father (O) = BO (which is type B)
- From mother (B) + father (O) = BO (which is type B)
- From mother (A) + father (B) = AB
Since the only alleles you can inherit from your parents in this scenario are A, B, or O, it’s genetically impossible for you to have blood type O if both parents are contributing A or B alleles.
Next Steps:
- Verify Blood Type Results: Since you’ve had multiple tests showing O+, you might consider asking for another blood type test or a different testing method for confirmation.
- Check for Errors: Inquire if there might be a recording error in your blood type tests or if there are special variations in blood type (like cis-AB) that could explain this.
- Family History Discussion: It might be worthwhile to discuss family health history with your parents or include them in your follow-up discussions regarding the blood type mismatches.
If you have other concerns or further questions, feel free to ask!
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