- ABO blood group system discovered by Landsteiner
- Universal donor: O group
- Universal recipient: AB group
- An example of multiple allele
- It consists of three alleles of a single gene IA, IB, Io., here ‘I’ stands for immunoglobulin
- The ABO grouping is based on presence of two inherited blood cell antigens and two serum antibodies.
- Individual who posses A group are found to have 'A 'antigen in their blood and 'anti B' antibodies in the serum. Like wise, B group individuals posses B antigen in their blood and anti 'A 'antibodies in the serum.
- O type blood group lack A and B antigens but posses anti A and anti B antibodies in the serum.
- AB blood group produce both the antigens but no antibodies.
ABO Blood Group Questions & Answers
1.Type of genotype in individual having blood group B will be
a) IA Io
b) IB Io
c) Io Io
d) IA IB
Ans: IB Io
2. A mother of blood group O has a group O child, the father could be of blood type
a) A or B
b) AB only
c) O only
d) A or B or O
Mother: O blood group= Io Io
Child : O blood group= Io Io
Blood group of father?
Here one allele Io comes from mother and the other from the father, ie. father can be IA Io, IB Io, Io Io
Ans: A or B or O