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Grade 9 Science · Problem type
ABO blood types from genotypes
Use this for “Which two genotypes give the same blood type?”
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Which blood type does the genotype give?
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Three alleles: Iᴬ and Iᴮ are codominant, and i is recessive to both.
Assumptions
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The ABO gene has three alleles: Iᴬ, Iᴮ and i.
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Iᴬ and Iᴮ are codominant, so IᴬIᴮ shows both; i is recessive to each of them.
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Tests often write these as AA, AO, BB, BO, AB and OO.
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