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Question

Write short note on A ,B and O blood group system in human beings.

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Solution

Dear Student,

ABO blood group system
was first identified by Karl Landsteiner in 1901.

Basis of classification of the blood groups is the presence or absence of the antigens A and B, which are carried on the surface of the red blood cells(RBC).

There are 4 types of blood groups-

1. TYPE A
2. TYPE B
3. TYPE O
4. TYPE AB

There are 3 forms of genes (alleles) that control ABO blood grouping. These are designated as iA, iB and i.

iA produces the A protein/antigen,
iB produces the B protein/antigen ,
whereas i allele doesn't produce any protein/antigen.

Since humans are diploid, there are 2 alleles present. The ABO blood group alleles show co-dominance, i.e., if allele iA and iB both are present, both get expressed.
BLOOD GROUP POSSIBLE GENOTYPES ANTIGEN PRESENT ON RBC ANTIBODY PRESENT IN PLASMA DONOR'S GROUP
TYPE A iAiA
or
iAi
A antigen anti-B A,O
TYPE B iBiB
or
iBi
B antigen anti -A B,O
TYPE O ii A antigen and B antigen NONE O
TYPE AB iAiB NONE anti - A and anti- B A,B,O,AB

Knowing blood group is essential to facilitate blood transfusion within compatible blood groups.

Regards

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