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This question refers to the abo blood type locus. remember that the a and b alleles are codominant to each other and both are dominant to the o allele. a man has blood type
a. mark all genotypes below that are possible for this man.

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BioWizard
The man with blood type  A might have one of two genotypes:
1. Iᵃ  Iᵃ 
2. Iᵃ  i
In this case, Iᵃ is an allele for A group, and i is an allele for 0 group.
The ABO blood type is controlled by a single gene (the ABO gene) with three types of alleles (Iᵃ   Iᵇ    and   i)

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