Blood type: Can an AB man has an O child?
544598
No, a man with type AB blood can NOT have a type O child... The way blood types work is that A and B are surface markers on the red blood cells that are inherited. Type O means that there are NO surface markers. A and B types are codominant (i.e., both dominant) over type O.  So...if your father has an AB blood type, your brother MUST be either A or B or AB for this man to be his genetic father...he can NOT be O, no matter what your mother's blood type is.  The genetics are thus:\n\nIf Dad is AB and Mom is O: the possibilities for the children are AO or BO (type A or type B).\n\nIf Dad is AB and Mom is A: possibilities are A, B or AB.\n\nIf Dad is AB and Mom is B: possibilities are A, B or AB.\n\nIf Dad is AB and Mom is AB: possbilities are A, B, or AB.\n\nP.S.--Just because it's not possible for your father and brother to be related, that doesn't necessarily imply that your mother is a bad person...it just means she made a serious mistake in being unfaithful.  Don't let that influence your love for your brother.
763275
just like any other trait, the baby can inherit the blood type from either the mother OR the father.\n\nHere's a link that shows possibilities for the baby depending on each parents blood type:\nhttp://mistupid.com/health/bloodinherit.htm
304367
O Negative is a universal blood type. Also, it is my blood type.
957650
Yes, it is very possible.  O negative means that the child has 2 recessive alleles (genes) for type and 2 recessive alleles for Rh factor.   Therefore, his genes would be oo --.\n\nThis is possible if both parents are heterozygous (have both a dominant and recessive form) for both traits.  That would mean Ao +-.  The A overrides the o and so does the + vs. -.  They show A+ then.  They both give the child the o and - ===> oo --, or O-. \n\nStatistically, 1/4 of their children can be O type, while the other 3/4 appear as A.  Same with + vs -.  One fourth would be negative while the other three fourths would be positive.
166617
They can't be the parents.  The baby is AB, so it has an A allele and a B allele.  Since bloodtypes are codominant, a person will have the B antigen if and only if they have the B allele (so they'll be either B or AB).  The parents are O and A, so neither one of them has a B allele.  The baby had to get it from someone else, so the father isn't the real dad.  Either they took home the wrong baby, or the mom was cheating with someone whose bloodtype was either B or AB.
581970
This is due to dominant and recessive alleles. For example, in the ABO blood groups, the alleles IA and IB are dominant to the allele IO. Therefore if the zygote is heterozygous for IA and IO blood types, the phenotype will be blood group A. This is because IA is dominant to IO.\n\nThe same principals can be applied to diseases like cystic fibrosis and sickle cell anaemia.\n\nThe heterozygous parent is not affected because the phenotype will be the dominant gene instead of the recessive one. So if two heterozygous parents mate, then there is a chance that the offspring will be homozygous for the condition and therefore the phenotype expressed will be of the recessive genes.
314497
All three of these answers above me are correct.  Your biological mother would have to be BO and your biological father would be AO and the O allele in each would be recessive, or not showing its trait because of the dominant a/b allele.  A Punnett Square would look something like this:  \nMOM    \n       ||||||||||  B |||  O  |\n       ------------\nD||     A| AB |  AO |\nA||     -------------\nD||     O| BO |  OO | <- That's you with type O blood.  If you had three siblings it would be likely that one would have AB blood, one type A blood, and one type B blood. \n       ------------
203519
A universal receiver would carry all the major blood antigens, and so not react adversely to any of those antigens if they received them in a transfusion.  \n\nA universal receiver would therefore carry the A and B antigens, and also be Rh factor positive.  So their blood type would be AB+.
439008
YES. Absolutely, despite all the answers you've received to the contrary. \n\nThe way blood groups are named, either your blood contains certain proteins (named A and B) or it doesn't - if you have both you are blood type AB; if you have only A you are A; if you have only B you are, you guessed it, B, and if you have neither you are blood type O.\n\nIf you have a gene for a blood protein, either A or B, you will have that protein in your blood. However, we have two copies of each chromosome, and it is possible that each parent has one copy of the A gene on one chromosome, and doesn't have it on their other chromosome (O). This means they will both be blood type A, since they each have one copy. However, if they have a child who happens to get the O chromosome from each of them, then the child will be blood type O. Mathematically expressed, each parent is AO, and on average their children have a 25% chance of being AA (blood type A and cannot have type O kids), 50% chance of being AO (blood type A but able to have type O kids), and 25% chance of being OO (blood type O).\n\nThis is the whole idea of recessive genes, which also explains why two brown-eyed people can have a blue-eyed baby without any hanky-panky going on.\n\nAs regards the Rhesus factor, i.e. the "+", again that is a recessive characteristic. The child must have received the Rh factor from his father, since his mother is negative. (NOTE that any Rh-negative woman who has an Rh-positive baby should get a shot of something called RhoGam, or WinRho, to prevent problems in future pregnancies.)
13809
Blood types are not evenly distributed throughout the human population. O+ is the most common, AB- is the rarest. There are also variations in blood-type distribution within human subpopulations. The figures given here are for people of European descent.\n\nType Frequency \nO+ 38% \nA+ 34% \nB+ 9% \nO- 7% \nA- 6% \nAB+ 3% \nB- 2% \nAB- 1%
199115
on red blood cells there are two major antigens A and B among other minor antigens.these designate one's blood group.\nBlood group O is indicative of one having no blood group antigens on his/her red blood cells.\nfor any blood group antigen there's a corresponding blood group antibody in the blood fluid i.e plasma or serum.for example if you are blood group A then your blood will have antibody B,if you have blood group B then you have antibody A.however if one is blood group O then that means that you have both antibodies A and B,and if you are blood group AB then you have no major blood group antibodies i.e neither antibody A nor B is present in your plasma.now if a blood group A person receives any blood group other than A or O then the antibodies in the plasma cause clumping(coming together)of the foreign blood cells.this causes blocking of the blood vessels with disastrous results.please note that it's the foreign blood cells that are clumped by the native antibodies if they match i.e A with Antibody A,B with antibody B,O with either A or B and AB by none.for this reason O can donate blood to any blood group but cannot receive blood except from another O and AB can receive blood from anyone but cannot donate their blood to anyone except AB.there is another group of antigens known as the rhesus factors.one is either rhesus positive(+) or negative(-).therefore a blood group O+ can donate blood to any rhesus+ blood group and blood group AB+ can receive any rhesus+ blood group.hence to answer your question blood group O can take blood only from an O of the correct rhesus factor
433957
A and B blood types are both dominant, so each parent could potentially be A0, and B0, meaning the children could be any combination of A,0 and B, 0, so: AB, A0, 0B, or OO.  The kid could be blood type A, B, AB, or 0.
797469
Your genotype determines your blood type before your born. There are three alleles or versions of the blood type gene: A, B, and O. Since everybody has two copies of these genes, there are six possible combinations; AA, BB, OO, AB, AO, and BO. In addition to the proteins (agglutinogens) existing on your red blood cells, other genes make proteins called agglutinins (a-GLOO-tin-ins) that circulate in your blood plasma. Agglutinins are responsible for ensuring that only the blood cells of your blood type exist in your body. People who have an AA genotype are said to have type A blood because the agglutinogen on their red blood cells has the enzyme activity associated with the A allele. It is important to recognize that people with the AO genotype also have the enzyme activity associated with the A allele, so they are also said to have type A blood. People with the BB and the BO genotypes are said to have type B blood. People who have the AB genotype have the enzyme activity associated with both the A and B alleles. These people have no agglutinins in their blood plasma.  In the case of blood type, both the AA and AO genotypes cause individuals to display the A blood type phenotype. Similarly, both the BB and BO genotypes cause individuals to display the B blood type phenotype. Individuals who are phenotypically type O or type AB have only one possible genotype, OO and AB, respectively. In different parts of the world, the fraction of individuals with blood type A, B, O, or AB differs. The frequency with which blood types are observed is determined by the frequency with which the three alleles of the ABO gene are found in different parts of the world (allele frequency). Variation in the allele frequency at the ABO gene reflects the social tendency of populations to marry and reproduce within a national, regional, or ethnic group. As people throughout the world intermingle to a greater extent, the distribution of the different blood types will become more uniform throughout the world. Hopefully that helps a bit!
639698
I don't think blood type has anything to do with it.  The best diet includes vegetables, whole grains and milk products.
704048
Firstly, the idea that your blood will never regenerate is false; blood cells have a life span of thirty (30) days, meaning that your body is constantly regenerating blood anyway.  However, if an individual loses a large amount of blood very rapidly, it is crucial that he or she obtain blood from a donor, because blood cannot be regenerated quickly enough to compensate for a large loss.\n\nSecondly, it is not common to get an O- blood type anywhere, as it is a recessive genotype to all the other blood types.\n\nIf your parents are both type O, then you are most definitely type O.  As for being O- as opposed to O+, it is very rare among families comprising mostly of O+ individuals.  (On the other hand, families with O- always have children with O- until another family member with another blood type joins the family).  However, it is possible if and only if a pair in your preceding family (i.e. great grandparents) were carriers of the O- blood type - this is likely, because you ended up with O- blood type.  There are a much greater handful of O+ individuals who bear O- genes than is apparent, but it's certainly possible; therefore, they are able to pass on those O- genes to their offspring.
786379
the woman is O (O, O)\nthe man is AB    (A , B )\n\n                                      O                     O\n                                       A                      B\n                                  ------------------------------\n                                      AO                    BO\n the blood type of the child may be AO (A) or BO (B)
38817
So not universal, but definitely most common, by a huge margin.\n\nUniversal would suggest everywhere, and its not true, there is of course AB, A and B blood types also.\n\nYou may be mixing up the term "universal donor", Type O-negative blood does not have any antigens. It is called the "universal donor" type because it is compatible with any blood type. Type AB-positive blood is called the "universal recipient" type because a person who has it can receive blood of any type. Although “universal donor” and “universal recipient” types are occasionally used to classify blood in an emergency, blood type tests are always done to prevent transfusion reactions.