Am I wrong in assuming that your baby will have either the mothers or fathers blood type. So if a mother was b- and the father a+ the baby would have either of those??
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08-07-2013 15:18 #1
Babys blood type
08-07-2013 15:24 #2
Not necessarily, because blood types A and B are actually AO and BO so it's possible that with that combination bub could also be O blood type. I'm not sure how the Rhesus factor is inherited but my understanding is that bub would have a 25% chance of being type A, 25% chance of being type B and 50% chance of being type O.
So possibilities are A+/-, B+/- and O+/-
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08-07-2013 15:24 #3
I'm not sure on this especially with + and - but couldn't the baby also be AB?
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08-07-2013 15:25 #4
ETA if you're AA, or BB, then the only option is AB+/-. So really it could be anything!
08-07-2013 15:26 #5
08-07-2013 15:29 #6
It's been awhile since high school genetics, but I don't think your assumption is necessarily correct.
In your particular example the child could end up being A, B, AB or O and could be either + or -.
I think the only absolute certainty is that O+ and O+ gives an O+, all other combinations can end up with different types.
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08-07-2013 15:30 #7
Thanks for the link RR! I didn't realize that 2 + blood types could still make a - blood type child!
08-07-2013 15:31 #8
Nor did I!!! How bizarre. I wonder what the chance is of it though?
08-07-2013 15:32 #9
Interesting question, never thought about it before, and I have no clue what any of my kids blood types are.
I had to google it to find out.
My mother had AB blood, I have AB Blood, and my daughter has AB blood. Her half brother by her mother has O. How is this possible?
-A curious adult from New York
February 7, 2012
This is a perfect question for a geneticist. To figure out how this is possible (which it is by the way), we need to step back and do a bit of review on how genes work. Here are the basics of what we need to know:
1.We have two copies of each of our genes, one from mom one from dad
2.These genes can come in different versions
3.Sometimes one version dominates another
So your AB blood type is actually two different versions of the blood type gene. You have an A version and a B version, one from your mom and one from your dad.
As you pointed out in your question, there's another version of the gene called O. This version is interesting because you can actually think of it like a zero or nothing. (Click here to learn why O is like a zero.)
An A and an O gives an A blood type and a B and an O gives a B blood type. In this case, that's what it means that some versions dominate others. The A and B versions override the O, but not each other.
Here are all six of the possible combinations of these three gene versions and their corresponding blood type:
AA or AO – A blood type
BB or BO – B blood type
AB – AB blood type
OO – O blood type
Now we are almost ready to show how your result came about. The last thing we need to know is that parents pass only one copy of their gene to their child.
So an AO parent (who is A blood type) will pass either an A or an O gene to their child. And an AB parent will only pass an A or a B.
This is all the information we need to explain how your daughter is AB and her half brother is O
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