Autosomal dominant conditions are genetic disorders caused by mutations in a single copy of a gene located on one of the autosomes, which are the non-sex chromosomes. Individuals with just one mutated copy of the gene can develop the condition, meaning that the disorder can be passed from an affected parent to their child with a 50% chance. Examples of autosomal dominant conditions include Huntington's disease and Marfan syndrome. These conditions can vary in severity and may present symptoms at different ages. Because only one copy of the mutated gene is needed for the disorder to manifest, these conditions often appear in multiple generations of a family.