Autosomal dominant genetic diseases are usually inherited from one affected parent (rarely both parents) although cases of sporadic genetic disease can also occur (with neither parent affected). See also details of inheritance patterns in Inheritance of Autosomoal Dominant Genetic Diseases.
Inheritance properties of Autosomal Dominant Genetic Diseases: Disease inherited from: Usually autosomal dominant diseases are inherited from one parent who has the disease. For a person to have the disease, one of the parents must have had the autosomal dominant disease. A child with the disease cannot be born to parents without the disease, except very rarely due to random genetic mutations (see sporadic genetic disease).
Gender bias in inheritance: Male and female children are equally at risk of autosomal dominant diseases because they have equal numbers of autosomes.
Inheritance odds for Autosomal Dominant Genetic Diseases: Overall odds of inheritance: Usually autosomal dominant diseases are inherited from one parent who has the disease. For a person to have the disease, one of the parents must have had the autosomal dominant disease. A child with the disease cannot be born to parents without the disease, except very rarely due to random genetic mutations (see sporadic genetic disease).
Sibling of diseased child odds of inheriting disease: Usually 50%. If one child has an autosomal dominant disease, it is typically because one parent has the dominant disease, with the other parent unaffected. If the cause is a sporadic mutation, then the other child usually has an extremely low chance (because the first child did not inherit the disease).
Overall odds of inheriting from mother: Usually 50% if any parent has an autosomal dominant disease.
Overall odds of inheriting from father: Usually 50% if any parent has an autosomal dominant disease. Mother to son inheritance odds: Usually 50% if any parent has an autosomal dominant disease.
Father to son inheritance odds: Usually 50% if any parent has an autosomal dominant disease.
Mother to daughter inheritance odds: Usually 50% if any parent has an autosomal dominant disease.
Father to daughter inheritance odds: Usually 50% if any parent has an autosomal dominant disease.
Inheritance from one diseased parent odds: 50%. For one parent with an autosomal dominant disease, and an unaffected second parent, there is usually a 50% chance of passing the disease onto children.
Inheritance from two diseased parents odds: Usually 75% chance if both parents suffer from an autosomal dominant disease. If both parents have the disease, they each have one bad gene and one good gene. The child has a 75% chance of disease (50% chance of autosomal dominant disease, 25% chance of double-dominance) and 25% chance of being a disease-free non-carrier (there are no carriers for dominant diseases).
Genetic carriers of Autosomal Dominant Genetic Diseases: Carriers possible for disease?: No, there are no carriers for a dominant disease. Everyone who has the genetic error gets the disease, because the bad gene is dominant. There is no such thing as a carrier for a dominant disease. A few autosomal dominant genetic diseases like Huntington's disease only cause symptoms later in life, so that people cannot always know that they have the disease in early life, but this is not the same as being a carrier: these people actually have the disease.
Odds daughter becomes genetic carrier: 0%. There are no carriers for an autosomal dominant disease.
Odds son becomes genetic carrier: 0%. There are no carriers for an autosomal dominant disease.
Inheritance features for Autosomal Dominant Genetic Diseases: Inheritance pattern: Vertical inheritance. Every generation is affected by an autosomal dominant disease, called a "vertical" pattern, as seen on a family tree. By comparison, recessive diseases tend to have a horizontal pattern with alternating generations affected.
Sporadic form of disease possible?: Yes, only one genetic mutation is required for a sporadic version of an autosomal dominant disease.
Double dominant form of disease possible?: Yes, in fact, double dominance applies mainly to autosomal dominant diseases, rather than to any other type of genetic disease.
Inheritance from one double dominant parent: Usually 100%. If one parent has double-dominant disease, even if the other parent is not affected, the chance is 100% chance of having children with the autosomal dominant disease. Male and female children have the same chance.
Inheritance of Autosomal Dominant Genetic Diseases refers to whether the condition is inherited from your parents or "runs" in families. The level of inheritance of a condition depends on how important genetics are to the disease. Strongly genetic diseases are usually inherited, partially genetic diseases are sometimes inherited, and non-genetic diseases are not inherited. For general information, see Introduction to Genetics.
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