The B blood antigen allele is most frequently found in populations in Asia, particularly in regions such as Central Asia and parts of India. It also has a notable presence among certain ethnic groups in Europe. Overall, the distribution of the B allele varies widely, but its highest frequencies are typically observed in these areas.
The IB allele is considered dominant to the i allele because it produces a functional enzyme that adds the B antigen to the surface of red blood cells, while the i allele does not produce any antigen. This means that when both alleles are present (IBi), the B antigen is expressed, resulting in the phenotype associated with the IB allele. In contrast, the presence of the i allele does not affect the expression of the B antigen, making IB phenotypically dominant.
Surface antigen
The O antigen is not an antigen that may be found on the surface of an erythrocyte. A and B antigens are present in the ABO blood group system, while the Rh antigen is part of the Rh blood group system. O blood type individuals lack A and B antigens on their red blood cells.
there are no antigen in O blood and both A and B antigen in O blood.
If someone inherits one A allele for blood type and one B allele for blood type, what will that person's blood type be?
a
Negative and positive mean nothing here. If both parents are O, then they are homozygous recessive and can only express O. OO X OO This is the only possible genotype for O blood if you have two parents expressing O blood.
I think it's type ABOf the "normal" A, B, AB, and O typings, AB is the least frequent. Otherwise, Bombay (O type with missing H antigen) phenotype is the least frequent.
Red blood cells with an antigen on their surface are said to be Rh positive, Rh+. Rh negative, or Rh-, do nothave the surface antigen.
The genotype for blood group B positive is BB or BO. This means an individual inherits one B allele from each parent, resulting in blood group B. The positive sign (+) indicates the presence of the Rh(D) antigen.
type A
The basis of ABO blood types is the kinds of antigens present on red blood cells determining the blood type. * Genetically, the A type is caused by a dominant allele IA; the B type by another dominant, IB; the AB type by codominance (genotype IAIB), and the O type by a recessive allele (i). Examples: genotype IAIA has phenotype blood type A IAi has type A IBi has type B ii has type O