O-LevelBiologyGenetics & Variation5090/11 · May/June 2016 · Q381 Mark

In the ABO blood group system, which alleles are codominant?

AI^A and I^B

BI^A and I^O

CI^B and I^O

DI^A, I^B and I^O

✓ Correct answer

A: I^A and I^B

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

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