In this type of inheritance pattern, a disorder typically appears in each generation, passed on by one parent of either sex who also has the disorder. Each child born to an affected parent has a 50% chance of inheriting the disorder and a 50% chance of being unaffected. There is no carrier status.
(also called Dominant Inheritance) A pattern of inheritance, in which a gene change has an effect even if only a copy is inherited from only one parent, e.g. the mutated gene that causes Huntington disease.
A gene that almost always results in a specific physical characteristic, for example, a disease, even though the patient's genome possesses only one copy. With a dominant gene, the chance of passing on the gene (and therefore the disease) to children is 50-50 in each pregnancy.