A-LevelBiologyInherited changeMay/June 2021Paper 4 Q79 Marks
People vary in which molecules are present on the surface of their red blood cells. For example, in the ABO blood group system, people may be categorised into one of four blood groups: A, B, AB and O. A single gene, I, with three alleles, determines these blood groups. Gene I is an example of a gene with multiple alleles. • Alleles IA and IB are codominant. • Allele I⁰ is recessive to alleles IA and IB.
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