The blood phenotype O can result from which genotype?

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Multiple Choice

The blood phenotype O can result from which genotype?

Explanation:
Type O arises when there are no A or B antigens on the red cell surface, which happens when both ABO alleles are the recessive i variant (genotype ii). In ABO genetics, IA and IB are dominant to i, and any genotype containing IA or IB expresses A or B antigens, producing type A or type B. Only the two i alleles lack A and B transferases, yielding the O phenotype. Among the options, the one with two i alleles matches this, while combinations with IA or IB would not be type O.

Type O arises when there are no A or B antigens on the red cell surface, which happens when both ABO alleles are the recessive i variant (genotype ii). In ABO genetics, IA and IB are dominant to i, and any genotype containing IA or IB expresses A or B antigens, producing type A or type B. Only the two i alleles lack A and B transferases, yielding the O phenotype. Among the options, the one with two i alleles matches this, while combinations with IA or IB would not be type O.

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