Is it possible for a child to have O negative blood type when both parents have A positive?
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.
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.
102601
Yes, type O can recieve type AB. I am a type O.:O) Any other blood types, more than likely your body will reject it. Along time ago my cousin had a tropical disease called dengue fever(mosquito disease) in tropical countries and she was a type O and the blood bank had little type O blood, so they mixed A and B blood together and it worked. She is now a happy and healthy woman. :O)
841971
That is correct. I hope you didn't find that out for the first time here on Yahoo Answers! That would be awful.\n\nTwo type A parents can only have type A or type O children.\n\nSince you are AB, one of your true biological parents would have type B or type AB blood. That's the only way you could have inherited a B allele to give you type AB blood.
760212
You don't have to show the same blood type necessarily. Blood type is inherited like most other traits, you get one allele from mom and one allele from dad. except in the case of bllod there are three alleles for blood: A, B and O. A and B are codominant and O is recessive (which means in order to show O type you must have two O alleles). So if your dad is O (OO), and your mom is AA or AO, you could be AO or OO. If your dad is OO and your mom is BB or BO, then you could be BO,or OO. If your mom is AB and your dad is OO, then you could be AO or BO. \nAs you can see there are quite a few combinations, so this explains why you may show a different type from your dad.\n Rhesus factor (the + or -) is a different heritable trait and much simpler. You are either positive or negative. Hope this helps.\n\nFor further reading check out \nhttp://www.purchon.com/biology/abo.htm
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       ------------
248532
Yes.  It is possible for a type O mother to produce antibodies that will cross the placenta and attack her baby's cells if her child carries either the A or B (or both) antigen.\nUsually antibodies against A and B are IgM - they are too large to cross the placenta, but type O people occassionally produce an IgG antibody (called anti-A,B).  This is the antibody that usually does the damage.\nThe baby has a chance for being type O (between 0 and 25%), and in that case there's no problem.  However, there's a 75 to 100% chance that the baby will be type A, so there could be a problem.\n\nThe chances of a type O mother's immune system attacking her baby's blood because of this anti-A,B antibody are rare, but in cases were a female is type O (especially if she's Rh positve), it is investigated along with other possible causes.
1147573
hehe. Something is amiss.  \nO is recessive. A and B are codominate.\nTo be true O, your genotype is OO.\nTo be B, your genotype is BB or BO.\nTo be A, your genotype is AA or AO.\nTo be AB, your genotype is AB.\nSo one of your parents have to have B allelle.  If either of your parents are OB (then in reality one of your parents is blood type B not O.), then it is possible that you are blood type B.\n\nIf not, well, your patients raised you and you consider them your parents.  Does it really matter that one of your parent is not you biological parent.  Talk to them.  Be patient and they may explain things to you when you get older.
94669
Yes, it is possible. The type B person could be type BO and the B is dominant so they are type B. The type A person could be type AO and the A is dominant so they are type A. If a BO person and an AO person have children, they're children have 25% change of being type O.
1101913
The main blood types are A, AB, B, and O.  These blood types are fromed due to a specific type of protein found on the red blood cells.  A type blood has A protein, while B has B protein.  O does not contain any protein so the O stands for zero.  AB contains both A and B proteins.  Along with this there is the Rh positive and negative type.  This is independent of the ABO grouping so  you can have all the ABO types plus the positives and negatives as well.  So far ther are 8 distinct types.  Along with this there is a M and N type.  This is more subtle and it is usually not tested for. So now we have 16 different types possible.
161031
A, B, AB, O\nthere are four which can either be negative or positive\n\n\n\nType O– blood is considered the “universal donor” because it can be donated to people of any blood type. Type AB+ blood is considered the “universal recipient” because people with this type can receive any blood type.
1115203
Can a man have, let's say, B+? Yes.\nCan a woman have, let's say, B+? Yes.\nCan they get married? Yes.\n\nExact same blood type will not be a problem. Only way for problem is if baby is + and mom is -. Only way for that to happen is if Dad is + and mom is -.
788436
You can rule out certain blood types, but you can't know the exact one for sure.  For example, you can be sure the father is not either blood type O or B, but he could be A or AB.  The rh factor isn't as easy to figure out.
174184
yes they can, the Rh is made up of two alleles and the baby receives one from each parent. If both parents are heterozygous for the d gene then the baby has a one in foud chance of being RhD negative
1061261
4 out my 5 sons have their dad's blood type while only one has mine. It really doezsn't matter though......\nWiserangel is nuts. A child HAS to have the blood type of one or the other parent. Can't just have one made up..........
673764
first all blood has 3 genes a,b,o.  A and B are both dominant while o is recessive.  A person with A phenotype blood can have a genotype of AA or AO.  Same with the B phenotype blood except only with B.  AB phenotype is the same as the genotype AB and same goes for O.  OO phenotype can only be seen as OO genotype.  When people do the nasty and mate each one type is paired with another.  For example an AO phenotype person and an B0 phenotype person can have a babies as AB,AO,BO,OO.  The punnet square all depends on two peoples blood type and the possibilities of the childs when they mate, you cannot make a square of an individual.
976080
Could be either baby if you are type O since the father could be A, B, AB, or O.  Depending on what the father is will tell you which baby is which.