Question

Which trait is normally controlled by multiple alleles but not multiple genes?

Answer 1

Multiple alleles:

1. Blood type in humans is normally controlled by multiple alleles but not multiple genes
2. Human blood type or ABO blood type is controlled by the ABO gene, which has three distinct alleles (multiple alleles), a, b, and I.
3. The a and b alleles show a specific dominance relationship known as codominance, which means that they jointly generate the AB blood type.
4. Since A is more dominant than I their combined blood type is A.
5. Additionally, B is dominant over I, resulting in the B blood type.