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Word Count: 527
Colorblindness is a defect of vision affecting the ability to distinguish colors There are many different types of colorblindness Partial colorblindness is called dichromatism The most common form is red-green and has a wide range of variability within this group from very mild to very extreme The second most common form is blue-green and a red-green deficit is usually associated with this form The most severe form of colorblindness is achromatopsia or monochromatism the inability to see any color People with achromatic vision see everything in shades of white black and gray kind of like a black-and-white picture It is also known as daltonism however colorblindness is the term more commonly used Daltonism originated from John Dalton a British chemist John Dalton was the first person to write a detailed report in 1794 on this condition Dalton himself was afflicted with this disorder Colorblindness is a sex-linked recessive gene Women need two genes to be colorblind Men only need one gene on their X chromosome because there is no normal gene on the Y chromosome to counteract the colorblindness gene This is a single gene disorder and is carried on the X chromosome It is not environmentally influenced it is a germ cell mutation from the parent cells Females can be carriers but males cannot and are more commonly affected Approximately 8 or 1 out of 10 men have some form of colorblindness and 05 or 1 out of 200 women have some form of colorblindness This disorder is present at birth it does not occur later in life and is not triggered by any specific event However it may occur as a temporary condition following a serious illness Colorblindness may exclude people from some jobs such as being a pilot where color vision is essential If a colorblind man and a woman with normal vision have children all of them will have normal vision However the defect is hidden in the daughters and
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