In some cases a trait may have more than one allele representing the characteristic. This is called multiple alleles. An example of this condition is Human ABO blood typing. A and B type blood are co-dominant while blood type O is recessive to both A and B. Hence your genotypes for A type blood are: AA and AO; B type blood: BB and BO; AB blood is AB, and O type is OO.
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In some cases a trait may have more than one allele representing the characteristic. This is called multiple alleles. An example of this condition is Human ABO blood typing. A and B type blood are co-dominant while blood type O is recessive to both A and B. Hence your genotypes for A type blood are: AA and AO; B type blood: BB and BO; AB blood is AB, and O type is OO.