The genotype of human blood group B is

Dear Student,

A human having blood group B must contain atleast one copy of allele B. Therefore, the genotype of human blood group B is either BB or BO. 

Regards
 

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Their genotype is either AA or AO. Similarly, someone who is blood type B could have a genotype of either BB or BO. A blood test of either type AB or type O is more informative. Someone with blood type AB must have both the A and Balleles.
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