Amino acids are primarily composed of carbon, oxygen, hydrogen, and nitrogen. Angelman syndrome a rare genetically inherited form of mental retardation. The inheritance of this syndrome is subject to genome imprinting . Carriers often do not show any signs of the trait but can pass it on to their offspring. This is the case with hemophilia .
Cataracts are common in elderly people.
They may be inherited or caused by environmental factors. In contrast, an acute disease is one with a rapid onset and a short but usually severe course. Neither allele is dominant or recessive, so that both influence the phenotype. Type AB blood is an example. Such traits are said to be codominant.