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WAHuman BiologyQuick questions
Unit 4: Human Variation and Evolution
Quick questions on Patterns of inheritance and variation: WACE Year 12 Human Biology Unit 4
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What are multiple alleles?Show answer
Some genes have more than two alleles in the population, called multiple alleles, although any one person still carries only two. The classic example is the ABO blood group gene, which has three alleles: IA, IB and i. Alleles IA and IB are codominant (both expressed when present together) and both are dominant over i. This produces four blood group phenotypes (A, B, AB and O) from six genotypes.
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