O-LevelBiologyGenetics & Variation5090/11 · Oct/Nov 2016 · Q381 Mark

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

AIᴬIᴬ only

BIᴬIᴬ, and IᴬIᴮ only

CIᴬIᴬ, and IᴬIᴼ only

DIᴬIᴬ, IᴬIᴼ and IᴬIᴮ

✓ Correct answer

C: IᴬIᴬ, and IᴬIᴼ 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 1, question 38.

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