How can a couple with A+ blood, have children with 0+ blood.?

Question

The reason I ask. 2 of our children have )0+ blood type. We are both A+. I read somewhere that in the Army they used to always type the men as A+ or 0+. So I wondered if they maybe typed my husband wrong? Or does this just happen that way. Just curious.

Answer 1

When talking about blood types, you inherit your blood type from both your mother and father. So, if you get "A" from your mom and "B" from your dad, you'll be AB.

When you say that you are "A", you could either be "AA" or "AO".

So, when two people with "A" blood have a child, the child could get an "A" from each parent and be "AA," or the child could get an A from one, and an O from the other and be "AO." In both of these cases, the baby will have A blood. However, if both parents have "AO," and the baby gets the "O" from both parents, then the baby will have O blood.

This is the same for the Rh factor (the + or - part of the blood type),

Source(s):
http://www.mistupid.com/health/bloodinherit.htm
http://www.bloodgivers.com/inherit.asp

Answer 2

both of you have AO blood group.
there are two alleles that determine your blood group. lets just say there are three things-A, B and O. now a blood group is made up by two of these together. and always A/B is dominant over O. so if A and O come together, the final expression will be A though you are actually made up as AO. so an A blood group can be because they have the genetic makeup as AA or AO.
Now when children are born, the blood group depend on their parents. since both of you are a A and your children are O, the only possibility is that you are AO.
please read up some genetics and you'll be able to understand what i've been trying to explain!

Answer 3

A person with A type blood is determined with his genes. The gene for A type blood, symbolized here as A, is dominant. That means that if it is paired with a recessive gene, the blood type would still be A. In your case, both of you must have Ai genotype, in which i is the recessive gene for the O type blood. It turns out, then, that your children inherited the i's from both of your genes, creating an O type due to ii, which has no dominant genes.

Answer 4

blood A is a dominat allele. blood O is recessive allele. 1 allele comes from father and 1 from mother. since A is dominant allele, only the characteristic of A will be express, dominant will over power the recessive which in this case, O. I think the both of you have AO, AO. thus both of you appear as A blood type but due to the O allele in the both of you. you may have 20% chances of obtaining OO children, which means O blood type children.

Answer 5

There are 4 possible bloodgroups in the ABO system (AB,A,B and O). You can have other antigens on your red blood cells (Rhesus factor).
There are 2 types of blood in the Rhesus system -ve and +ve (obviously you belong to one of these groups). Therefore the Abo system can be multiplied by the Rhesus factor giving 8 different blood groups - e.g. AB+ve, AB-ve, A+ve, A-ve etc. Inheritance of the Rhesus factor is straight forward, but inheritance of the ABO system is not. This is to do with dominant and recessive genes and the fact that the ABO system has 3 alleles, 2 of which are co-dominant whilst the other is recessive.have inherited the recessive Io allele from both parents. They therefore have the Blood Group O.

Answer 6

Even though type A is dominant as far as genetics go, there is still the recessive gene that has a 1 in 4 chance of manifesting itself in the offspring.

Answer 7

You might need to have him rechecked just to be sure, incase he has a medical problem. Im not sure about the blood types ive heard so many stories.

Answer 8

Choc and HPhere4you are correct. This is completely normal.

Answer 9

their grandparents (i.e ur parents) might have O+ blood...

Answer 10

everyone has recessive genes (genes that are secondary to the genes that are expressed).