O-LevelBiologyGenetics & Variation5090/11 · May/June 2010 · Q371 Mark

Which statement about human blood groups is correct?

Aperson with the blood group A cannot have an Iº allele.

Bperson with the blood group B may have either the genotype IBIB or IBIº.

CIn a person with blood group AB, the IB allele is recessive to the allele Iᴬ.

DThe alleles Iº and IB are co-dominant and have equal effect on a phenotype.

✓ Correct answer

B: person with the blood group B may have either the genotype IBIB or IBIº.

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, May/June 2010 Paper 1 Variant 1, question 37.

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