Beginning of Essay
. The word refers to a group of inherited conditions. People with have little or no pigment in their eyes, skin, or hair. Recently a test has been developed to identify carriers of the gene for ty-neg and for other types in which the tyrosianase enzyme does no ....

Middle of Essay
.... body. This is believed to be caused by an enzyme deficiency involving the metabolism of melanin during prenatal development. This can be inherited by an dominant or recessive trait. In complete , there is lack of pigmentation in skin and hair, as well as in retinal and iris tissue; in incomplete , skin and hair may vary from pale to normal; in ocular , function may vary from norma to impaired. Impairments may involve the retina and iris. If a person has then they usually have somewhere between 20/70 and 20/200 visual. Ty-Neg or also called type 1A results from a genetic defect in an enzyme called tyrosinase. Tyrosinase helps the body to change th ....