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.
Sex-linked disorders. Genetic diseases or conditions caused by a mutation on the sex chromosomes. Patterns of inheritance tend to be gender-specific. Single gene disorders. Genetic diseases or conditions caused by a mutation in a single gene or DNA sequence. Also known as Mendelian, Classical and Monogenic disorders.They are usually passed from one generation to the next. Somatic cells. Non-sex cells (not ova or sperm).Somatic or sporadic mutation.he predicted course and outcome of a disease. Recessive disorders. Genetic disease or condition caused by a mutation on both genes in a pair (homozygous). The disease or condition only arises when both parents pass on a copy of the faulty gene.