Describe a trait that is controlled by multiple alleles?

Answer 1

Multiple Alleles

The term "multiple alleles" is used to describe when a trait is controlled by more than two alleles.

This is simple and the only other thing to know is that even if a trait is controlled by more than two alleles each offspring still only inherits two. For example, a person cannot have ABo blood as it has more than two alleles.

Blood type is the most common example of this as it does have three alleles, specifically "A", "B", and "o" blood types. Each of these controls the production of different antigenic substances on the surface of red blood cells. In this case both A and B are dominant and in the case of AB blood type codominance occurs. Meanwhile, type o blood is recessive. This blood type results in no antigens being produced. This is important in many medical situations, especially those involving blood transfusions, because the body of people receiving a blood transfusion rejects antigens that it is not familiar with and must therefore receive blood from people with the same blood type or with the o blood type because it does not produce any of the antigens that could be rejected, the reason for which it is considered the "universal donor" while AB is the "universal receiver" because it is familiar with both of the antigen types.

Answer 2

Eye color in humans is controlled by multiple alleles. There are multiple variations of the gene that determines eye color, such as blue, green, brown, and hazel. The combination of these alleles results in a wide range of eye colors observed in the human population.