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22. Variation And Genetics eLearn.Punjab
MN Blood Type or Blood Group System
Human blood groups can be of many types, e.g. ABO, MN, MNSs, Rh ete. Landsteiner
and Levine discovered MN blood types in man on the basis of specific antigens present
on RBC. These RBC antigens induce production of their specific antibodies. There are
three general phenotypes; M,N and MN. M phenotype has antigen M which is produced
by gene LM. N phenotype has antigen N that is produced by its allele LN. MN phenotype
has both M and N antigens, simultaneously produced by their alleles LM and LN
Phenotvoe Genotype Antieens on RBC
M lMlM M
N lN lN N
MN lMlN M and N
If a man of M blood group marries a woman of N blood group, all their children will
have MN blood group (Fig. 22.8)
Animation 22: Blood Group System
Source & Credit: waynesword.palomar
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