Is it possible for an O+ man to father an AB+ child?

Question

We did a blood typing experiment in class the other day and I had trouble reading my results. I thought that I might be O+ because I couldn't really see any clumps forming with my blood interacting with the anti-A or anti-B serum. I called my teacher over to ask him and he looked, pointed out a couple tiny clumps, and said that my results meant that I was AB+. My dad is O+ and my mom is A+ and, from my understanding of genetics, that would mean that I would have to be A+ or O+ right? Could the test be wrong or is my dad not my biological father?

I'm pretty sure on my mom and dad's blood types. My dad had to have open heart surgery in 1991 and they listed him as being O+ and my mom had a blood transfusion two years ago and they said she was A+. Plus, I've been with both of them when they donated blood.

Would the Red Cross even test my blood type seeing that I can't give blood? I tried to give blood once but they told me that I couldn't because I only weigh 102lbs.

Answer 1

Before you jump to any conclusions, realize that:

1. You had a problem with reading the results which didn't sound too conclusive to me.
2. In a school lab, the containers could have been mis-labeled or somebody could have switched the labels.
3. Any gene can mutate spontaneously.
4. Your dad might be wrong about his blood type.

I wouldn't give it a second thought, if I were you.

Answer 2

You could also be A- or O-. You could be anything that does not include B.

To confirm the test, donate blood. The Red Cross will obviously type it for you.

Answer 3

the red cross is going to take your blood anyway because they can use for some else. i would have some one else do my blood check again.

Answer 4

No, it would not be possible. Your teacher was probably wrong about clumps forming.

Answer 5

better do a DNA test kekekekke......