During a dermoscopy assessment, the pigmented skin lesion is typically covered with a liquid (usually oil or alcohol) and examined under a specific optical system. Applying oil reduces the reflectivity of the skin and enhances the transparency of the stratum corneum.
(October 2008). A genetic disorder is a genetic problem caused by one or more abnormalities in the genome, especially a condition that is present from birth (congenital). Most genetic disorders are quite rare and affect one person in every several thousands or millions. Genetic disorders may or may not be heritable, i.e., passed down from the parents' genes. In non-heritable genetic disorders, defects may be caused by new mutations or changes to the DNA. In such cases, the defect will only be heritable if it occurs in the germ line.
There are three types of genetic disorders: 1  Single gene disorders are caused by a mutation in a single gene. 2  The mutation may be present on one or both chromosomes (one chromosome inherited from each parent). 3  Sickle cell disease, cystic fibrosis and gCJD are examples of single gene disorders.ereditary genetic disorders. In hereditary genetic disorders, a mutated gene (one with changes in the DNA) that causes disease is passed down through generations of a family.