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.
Usher Syndrome is also a type of autosomal recessive disease which is a result of a faulty gene. This syndrome is categorized into three types which can be seen in different age groups-type 1, type 2 and type 3.here is a specific pattern of inheritance of genes in autosomal dominant diseases. The offspring inherits a copy of normal gene and mutant gene from its parents. Either of the parents may often suffer from a disease and thus the abnormal gene is passed on to the child.