The autosomal-dominant heredity is a kind of heredity for which a damaged allel (dominant heredity) on one of the two allogenic chromosomes is already sufficient for a characteristic value.
The genetic information is in one of the 22 autosomes, and is passed on without regard to gender. Descendants have a 50% risk of getting the damaged allel and of having the characteristic. If both parents have a certain anomaly and are heterozygous, the risk rises to 75%. If one parent is homozygous, the risk is at 100%. However, these values have a rather theoretical significance in hereditary diseases, since homozygous carriers often got that sick that they did not attain a reproduction age.