Can a child have a different blood group from both it's parents?

Answer 1

First, let's look at the ABO blood types. Each person receives an A, B, or O gene from each parent. In this system, the A and B genes are co-dominant and the O gene is recessive. Thus, a person whose genetic type is either AA or AO will have blood type A, those with genetic type BB or BO will have blood type B, and only those genetic type OO will have blood type O. This means that a child with type O blood could have parents with type A, type B, or type O blood (but not with type AB). Conversely, if two parents both have type O blood, all their children will have type O blood.

Another medically important blood type is described in the Rh system. These genes were first discovered in the rhesus monkey, hence the designation Rh. The Rh system is actually far more complex than the ABO system in that there are 35 different possibilities that one could inherit from each parent. These, however, are roughly grouped into positive and negative types. In this system the positive are dominant over the negative. If your genetic type is ++ or +-, your blood type will be Rh positive. Only if your genetic type is -- will you be Rh negative. This means that if both parents have Rh+ blood with the +- genes, they could have children who are ++, +-, or --. In other words, their children could be either Rh positive or Rh negative. Children who are Rh negative can have parents who are either Rh positive or Rh negative.

Two parents who have O positive blood could easily have a child who is O negative. In fact, most children who are O negative have parents who are positive, since the +- combination is so much more common than the -- combination.

As it turns out, there are more than a dozen complete blood group systems other than the ABO system and the Rh system. This makes great precision possible in looking at inheritance and family trees.

There is no reason, based on your blood type, to suspect that your parents might not really be your parents. If questions linger for other reasons, specific tests are available through blood banks that can settle the issue. Given the billions of unique people on this planet, the power and precision of genetic testing are amazing.

Source:

http://www.drgreene.com/21_59.html

Answer 2

Referring to the ABO blood group, then yes it is perfectly possible.

You can have the following 4 blood groups:

A with genotype AA or AO (caused by the fact that the A allele cause an A antigen to be produced, so this is present in both homozygotes and heterozygotes)

B with genotype BB or BO.

AB with genotype AB

or O with genotype OO.

Here is one example. Parent 1 has blood group A with genotype AA and parent 2 has blood group with BB.

All offspring will have genotype AB which will be different from either parent.

Another example is two AB parents (AB x AB) 1/4 will have blood group A and 1/4 blood group B, again different from their parents.

There are several different combinations that will give rise to individuals with a different blood group from their parents.

If you want to work them out then make a 6 x 6 table of all the possible genotypes: AA, AB, AO, BB, BO, OO and look at all possible combinations. Remember to convert genotype to blood group before reaching the final score

Answer 3

Actually YES. Even if a mother and a father both have AB blood group, child can have group 0. It's connected with epistasis, as far as I remember - genes responsible for blood group can be blocked by another, and child has no blood anti-genes, which is characteristic for group 0. However his genetic blood group can by either AA, AB or even BB, phenotycally it's 0.

Answer 4

Blood group names
Your blood group depends on which antigens occur on the surface of your red blood cells. (Your
genetic make-up which you inherit from your parents determines which antigens occur on your red
blood cells. Because of this fact a blood group test is sometimes used to help settle disputes about
who is the father of a child.) Your blood group is said to be:
 A+ (A positive) if you have A and rhesus antigens.
 A- (A negative) if you have A antigens, but not rhesus antigens.
 B+ (B positive) if you have B and rhesus antigens.
 B- (B negative) if you have B antigens, but not rhesus antigens.
 AB+ (AB positive) if you have A, B and rhesus antigens.
The main reasons to know your blood group is if you need to have a blood
transfusion and if you are pregnant.
Page 1 of 2
 AB- (AB negative) if you have A and B antigens, but not rhesus antigens.
 O+ (O positive) if you have neither A nor B antigens, but you have rhesus antigens.
 O- (O negative) if you have do not have A, B or rhesus antigens.

Answer 5

Yes - look on National Blood Service website and it tells you what blood groups combined will result in. So if you have the parents blood groups you can see what the child could have. xx

Answer 6

Yes.

If both parent is AO (Blod group A) or BO (Blood group B), the children could have OO (Blood group O) if they receive two O alleles from the parents.

Answer 7

Yes .. it's quite simple mendelian genetics.
Everyone carries two (not including rheasus +/-) blood groups genes, one from dad, one from mum.

So if you had a Mum with AO (being blood group A) and a Dad with BO (being blood group B) you could be blood group A... B... O... or AB depending on which gene they pass on.

Answer 8

probable. My husband and that i are both O so our youthful ones are O. If a mom replaced into AO and the daddy replaced into BO, the youngsters might want to be AO, BO, OO, AB. So if you're asking if AO/BO moms and dads may have a AB baby then definite. if you're asking if AO/OO moms and dads may have a BO or AB baby then no.

Answer 9

No, I dont believe so, as your blood group is decided by one or both of your parents. I think you can have a different and incompatible bloodtype to your mum, but then it would be your dads bloodtype. I know this because me, my brother and sister have my dads blood type, and my mum has the really rare one, (cant remember exactly what. AB-, maybe?) and she had to have injections throughout each pregnancy to stop her miscarrying.

Answer 10

It is possible, even if both parents have the same blood type. E.g. if both parents are type B and have BO antigens, they could have children who are BB, BO or OO