O blood type parents have A blood type child?

Both of my parents have O blood type and I have A is that possible?
Answer:
There are basically three genes involved in the ABO blood typing: A, B, and O. The genes for A and B will always be expressed if they are present, but O is recessive, so in order for someone to have type O blood, the only two genes they can have is O (one from mom and one from dad).

It is biologically impossible for your parents to both have type O blood and you have type A blood. I wish I could tell you otherwise but I cannot. I suggest you have a heart to heart with your parents if they have never mentioned adoption or the like.

Now, To the poster that said that he has O neg but his parents are not type O, that is not really surprising. All this means is that your parents both have at least one gene for type O blood and you happened to get the two recessive O genes (this is a 1 out of 4 possibility...so if you have siblings, they have a higher likelihood of not having type O blood).

I'm type AB, one sister is type O, and the other sister is type B. Because of this, I know that my mother's genotype (the genes involved in causing her blood type) is AO (she has type A blood) and my father's genotype is BO (he has type B blood). Because of this match up, it is a rare situation where their offspring had a 25% chance of being A, B, AB, or O. As it stands, they had 3 kids and 3 different blood types.

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That is not possible if they are the genetic parents.

However, if you were adopted or they are not your genetic parents, it is possible.

It's also entirely more probable that one of them simply is mistaken about their blood type.

The genetic rundown for blood types is as follows:

Let A,B represent an allele for A or B blood. Let O represent an absense of either A or B allele.

Type A blood can be ---- AO or AA
Type B blood can be ---- BO or BB
Type O blood can be --- OO only
Type AB blood can be --- AB only.

So if you were concieved by your parents, recieving one allele from each of them, If they were type O's then you could only have received O allele's.

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Two people with blood type O cannot have a biological child together with blood type A.

Two people with blood type O can however serve as parents to a child with blood type A.

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Yeah. NONE of my parents have O negative, but I've got it. I actually asked a blood expert and he said there are a LOT more things involved that JUST what your parents have. So, yeah, it's possible. Either that, or you might want to look a little closer at your mailman. ;)

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Not if they are your genetic parents. I am deeply sorry if you just found out that you are adopted. It can be very rough, but it's not all that bad. If your parents treat you well and make you safe and comfortable, they might as well be your parents!

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it dapends on that cant happen becouse your mother cant re produse on her own thats impossible.

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yes, it is possible. it is the same case with my parents (both O) and my little sister (A). it's really pretty rare, but obviously happens. mutations, baby. (there is only a one-base difference between A and O, so a mutation from O parents to A child is much more likely than from O parents to B or AB child.)

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Yes it is possible.
http://www.biology.arizona.edu/human_bio...
On the left, scroll down and click; "Blood Type calculator".

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I hate that you had to ask this question on Y/A's, because you're going to get some strange and blunt answers. You are either adopted, or your dad is not your biological father. Your mom could have been artificially inseminated. They could have also switched you at birth at the hospital with someone else's baby. You need to have a heart-to-heart with your mom first and find out what happened, or this will haunt you. Maybe she's been keeping a secret. It's also possible that there's a lab error regarding your or your parents' blood type. Good luck to you with this.

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In general, if both parents are blood type O, then the child will be blood type O. It is possible, though rare, for both parents to be blood type O and the child be type A, B or AB. This would require a mutation from either parent in the germ cells (sperm or egg) to change the germ cell gene from an O blood type to an A or B blood type in order to have a child with A or B blood type. As an aside, it would be very rare for someone to end up with AB as both parents would have have to have a mutation in the germ cells-one for the A and the other for the B blood type.

Also, lab error is always a consideration (in the case of your blood typing, and the blood typing of your parents). In order to rule out labe errors, you will need to have them re-check their types and you re-check yours and see if the results are the same. Also, you might want to check with your physician for further advice.

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damn you're in trouble..

blood type A and B are dominant alleles over O but codominant to each other

for a person having a parent with blood type A mom and blood type B dad the offspring must be AB, since they are codominant

in your case since both parents are O, you should also be an O since O is recessive

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