|The MN Blood Group|
|Genotype||M molecules||N molecules||Phenotype|
LM LN X LM LN|
1/4 LM LM
1/2 LM LN
1/4 LN LN
The phenotype is determined by the production of 2 molecules located on the surface of red blood cells.
Crossing heterozygotes results in a 1:2:1 genotype and phenotype ratio.