O-LevelBiologyGenetics & Variation5090/12 · Oct/Nov 2016 · Q381 Mark

The inheritance of the ABO blood groups depends on three alleles I^, IB and Iº. What are the possible genotypes for a person of blood group A?

AI^IA only

BI^IA, and I^IB only

CI^I^, and I^Iº only

DI^I^, I^Iº and I^IB

✓ Correct answer

C: I^I^, and I^Iº only

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Topic: Genetics & Variation, O-Level Biology (syllabus 5090). Multiple choice, 1 mark.
Source: O-Level Biology, Oct/Nov 2016 Paper 1 Variant 2, question 38.

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