O-LevelBiologyGenetics & Variation5090/11 · Oct/Nov 2014 · Q381 Mark
In the ABO blood grouping system, which genotype is homozygous dominant?
AI<sup>A</sup> I<sup>O</sup>
BI<sup>A</sup> I<sup>B</sup>
CI<sup>B</sup> I<sup>B</sup>
DI<sup>O</sup> I<sup>O</sup>
✓ Correct answer
C: I<sup>B</sup> I<sup>B</sup>
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