refers to a pattern of Mendelian inheritance in which a feature of an offspring requires the presence of only one mutant allele, carried on an autosome, to produce its effect (see dominant allele). Even when the other allele is normal, the individual has the characteristic or susceptibility to that characteristic that is mandated by the mutant allele. Individuals with diseases have a 50:50 chance of passing on the mutant allele (and hence the characteristic, disease, or susceptibility) to any offspring.
AUTOSOMAL DOMINANT: “An example of an autosomal dominant disease is Huntingdon’s Disease, for which individuals may be carriers or actually exhibit the disease.”