Velu , Akash 12/10/11 P2B Abrams. Color blindness. By Akash Velu. Other Names for Color Blindness. Color Blindness Color Deficiency These are the only two names for color blindness. However, there are many types of color blindness. Here are four: Protanomaly Deuteranomaly Protanopia
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People who have color blindness will also have trouble seeing brightness of colors. In a few cases, color blindness can be caused by a drug called hydroxychloroquine which helps treat arthritis. However, it is mainly a genetic disorder.
Color Blindness is a genetic disorder when a person cannot tell some colors apart. For example, people with color blindness may think that red is green. Color blindness is often mistaken as people seeing in black and white. However, this is not the case. Color blindness is caused because the person with color blindness is lacking a type of cone in their eye that helps see red, green, or blue light.
Color blindness is inherited from a gene on the X chromosome. Men have only one X chromosome. On the other hand, women have two. This means that in order for a man to have color blindness, men only need one gene for color blindness(from one parent.) However, women, to be color blind, need a gene from both their parents. If a woman only has one, the normal gene on her second X chromosome will dominate over the color blindness gene. In other words, the gene for color blindness is recessive.
Color Blindness is more common in men than in women. This is explained in slide four(the previous slide. ) Since men have only one X chromosome, even if they only get one color blindness gene, that person will be color blind. However, in order for a woman to be color blind, they need two genes for color blindness because women have two X chromosomes, and the normal chromosome is dominant, but the color blind chromosme is recessive. About 1 in every ten men have some type of color blindness. Also, only about 0.5 % of the women born are color blind.