If this happens, codominance occurs because both normal and sickled shapes are mixed and seen in the blood. If a person has a single copy of the sickle cell allele, then half their red blood cells become abnormally shaped. Sickle cell anemia is a disease where red blood cells become thin and stretched out. There are several combinations of blood types that can result, but when a person has both an A and a B allele, it will lead to blood types visible in the blood, AB. The ABO gene determine what blood type a person has, and everyone has two copies of this gene, one from each parent. People with this blood type have A and B proteins at the same time.
Note, codominance is not the reason some people have two different colored eyes. Both traits or characteristics are visible at the same time. In general, it is a genetic situation where there is neither a dominant or a recessive allele and both are expressed equally. The alleles that always appear as a characteristic and are present are known as dominant alleles, and those that are hidden by the dominant alleles are called recessive alleles.įinally, when both alleles are expressed or appear in some situations it is called codominance. The alleles may make the flower red, pink, violet, etc.
Humans, along with other living things, also have genes or alleles which are responsible for many characteristics.įor a flower, an example of an allele or gene may be for its color. These genes for a specific trait, such as eye color, may exist in different forms known as alleles. Genes are the units of hereditary information that are responsible for many of a person's characteristics.
A person's appearance, and often how they act, is due to the genes located on segments of chromosomes.
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