Understanding Difference Between Genotype and Blood Group
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A blood test is used to determine whether the A and/or B characteristics are present in a blood sample. It is not possible to determine the exact genotype from a blood test result of either type A or type B.
If someone has blood type A, they must have at least one copy of the A allele, but they could have two copies. Their genotype is either AA or AO. Similarly, someone who is blood type B could have a genotype of either BB or BO.
Blood type Possible genotypes
A AA
AO
B BB
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 B alleles. The genotype must be AB. Someone with blood type O has neither the A nor the B allele. The genotype must be OO.

www.biology.arizona.edu/human_bio/problem_sets/blood_types/genotypes.html

(05-23-2019, 01:41 PM )
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