Studies performed with the rhesus monkey lead to the discovery of this factor, hence the name Rh factor. Known as the Rhesus factor or Rh factor, this antigen may be present or absent from red blood cells. In addition to the ABO group antigens, there is another blood group antigen located on red blood cell surfaces. MAURO FERMARIELLO/Science Photo Library/Getty Images Since people with type AB blood have no A or B antibodies in their blood plasma, they can receive blood from persons with A, B, AB, or O type blood.īlood Group Test. This can be deadly as the clumped cells can block blood vessels and prevent proper blood flow in the cardiovascular system. If this person is given blood of type A, his or her type A antibodies will bind to the antigens on the type A blood cells and initiate a cascade of events that will cause the blood to clump together. For example, a person with blood type B makes antibodies against blood type A. The antibodies in the blood plasma are A and B.ĭue to the fact that a person with one blood type produces antibodies against another blood type when exposed to it, it is important that individuals be given compatible blood types for transfusions. There are no A or B antigens on the blood cell. There are no A or B antibodies in the blood plasma. The antigens on the blood cell are A and B. The antigens on the blood cell are B and the antibodies in the blood plasma are A. Type B: The genotype is either BB or BO.The antigens on the blood cell are A and the antibodies in the blood plasma are B. Type A: The genotype is either AA or AO.AB blood type is an example of co-dominance since both traits are expressed equally. When one of the inherited alleles is A and the other is B, the genotype is heterozygous and the blood type is AB. When both inherited alleles are O, the genotype is homozygous recessive and the blood type is O. The A and B alleles are dominant to the O allele. There are six possible genotypes (genetic makeup of inherited alleles) and four phenotypes (expressed physical trait) for human ABO blood types. These multiple alleles are passed from parent to offspring such that one allele is inherited from each parent. ![]() While the genes for most human traits exist in two alternative forms or alleles, the genes that determine human ABO blood types exist as three alleles (A, B, O). InvictaHOG/Wikimedia Commons/Public Domain Image ABO blood group antigens present on red blood cells and IgM antibodies present in the serum.
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