Multiple Alleles

Edexcel A-level BiologyGenetic InformationLesson 14 of 30

Many genes have multiple alleles: three or more alleles of the gene exist in the population. However, a diploid individual still carries only two of them, one on each homologous chromosome.

The best-known example is the human ABO blood group, controlled by one gene with three alleles:

• I^A codes for antigen A on red blood cells
• I^B codes for antigen B
• I^O codes for no antigen

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Multiple Alleles

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