Difficult or painful digestion-dyspepsia
For example, the ABO system of blood groups is controlled by three alleles, only two of which are present in an individual.
<span>Some of the more common single-gene disorders include cystic fibrosis, hemochromatosis, Tay-Sachs, and sickle cell anemia.
Even though these diseases are primarily caused by a single gene,
several different mutations can result in the same disease but with
varying degrees of severity and phenotype.</span>
Answer:
codominance from what I remember
