3/9/11

How color blindness is inherited

Color blindness is x-linked recessive genetic disease. Unable to distinguish colors. Decide the disease the color blindness gene is recessive, located on the x chromosome. Sex chromosomes XX for women, women of color blindness in patients with genotype x \"x\", carrier x \' of x. , Normal female x \"x\". Male sex chromosome XY. X \"y for male patients, x \' y is a normal male.


Since it is x-linked recessive, so color blind male incidence of morbidity than women. Crowds are often seen in male patients. Pedigree cross seen in genetic.


If the male patients and normal female marriages, son is normal, daughters are carriers. If a blind woman \' s charms to bring and normal male mating, pathogenesis of descendant son of one-second in May. Daughter not ill but one-second for the carriers. If women with achromatopsia carrier and male mating, descendants in the pathogenesis of daughter l/2 may, one-second for the carriers, pathogenesis of son one-second, one-second OK.

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