Addition (often signified by the plus symbol +) is one of the four elementary, mathematical operations of arithmetic, with the others being subtraction, multiplication and division. The addition of two whole numbers is the total amount of those quantities combined.hen addition is used together with other operations, the order of operations becomes important. In the standard order of operations, addition is a lower priority than exponentiation, nth roots, multiplication and division, but is given equal priority to subtraction.
Xeroderma pigmentosum is one of the inherited DNA repair disorders, which also include Cockayne syndrome, trichothiodystrophy, Bloom syndrome, RothmundâThomson syndrome, and Werner syndrome. It is inherited as an autosomal-recessive disorder and is characterized by a hypersensitivity of the skin to ultraviolet radiation, a deficiency in the repair of damaged DNA, and a resultant high incidence of skin cancers.
Causes of Werner Syndrome. Werner Syndrome is caused by mutations of the WRN gene, and there are a number of different mutations that can cause the condition. WRN has been identified as important in order to manufacture Werner protein in the body, which is required to repair and maintain DNA.y Mark Jaimison. Werner Syndrome is uncommon, but it is one of the more regular types of premature ageing disorders seen in humans and was identified in 1904 by a German scientist, Dr. Otto Werner.