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The ishihara color test, which consists of a series of pictures of colored spots, is the test most often used to diagnose redgreen color deficiencies. A figure (usually one or more arabic digits) is embedded in the picture as a number of spots in a slightly different color, and can be seen with normal color vision, but not with a particular color defect. The full set of tests has a variety of figurebackground color combinations, and enable diagnosis of which particular visual defect is present.   a color blindness gene is a gene linked with colorblindness. Over 50 genes have been associated with color blind genetic traits, and many of them are found on the x chromosome, leading people to consider color blindness an example of an x or sex-linked trait. And people needseveral genes to make these photo pigments, and any defect in these genes lead to color blindness. Is color blindness recessive or dominant? Color blindness is basically a recessive condition linked to sex it is transmitted in the 23 pair of chromosomes, which are spaghetti-like strands packed with genetic info. Genes that are found on sex chromosomes are called sex-linked genes. These genes can be on either the x chromosome or the y chromosome. If a gene is located on the y chromosome, it is a y-linked gene. These genes are only inherited by males because, in most instances, males have a genotype of (xy). The gene for red-green color blindness is an x-linked recessive gene. X-linked recessive genes are expressed if theyre present on both x chromosomes in females, and on one x chromosome in males.   red-green color vision defects and blue cone monochromacy are inherited in an x-linked recessive pattern. The opn1lw and opn1mw genes are located on the x chromosome, which is one of the two sex chromosomes. In males (who have only one x chromosome), one genetic change in each cell is sufficient to cause the condition. Colour blindness is a common hereditary (inherited) condition which means it is usually passed down from your parents. Redgreen colour blindness is passed from mother to son on the 23rd chromosome, which is known as the sex chromosome because it also determines sex. Sex chromosomes also carry some genes for non-sexual characters such as colour blindness and haemophilia. Such genes which are always associated with sex chromosomes are called sex-linked genes. In man and drosophila the sex chromosomes (x and y) are unequal in size and shape, x being larger and rod shaped whereas y is small and slightly curved. Genetics of color blindness the traits are determined by genes showing sex-linked genetic modes of inheritance. The most common colors that cannot been seen by a color blind individual are red and green. In the genetics, the gene that determines color blindness is a recessive trait, whereas normal color vision is the dominant trait.

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