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Color blindness is diagnosed when it is realized that a person cannot see certain colors. There are tests that can be taken to determine this.
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John Dalton discovered color blindness in 1792 when he perceived a flower as being blue when it was actually pink. The first major study was published in 1794.
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A gentleman by the name of John Dalton who was color blind himself wrote a study in 1794. Dalton was actually famous for his work on the theory of atoms.
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The gene for the color blindness train is located on the X chromosome, men are more likely to be color blind due to the way that it is inherited.
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