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Colorblindness in humans is x-linked recessive trait.

problem: One out of every 12 human males has red green colorblindness. How common is it among human females. Can you show me how to determine its prevalence among females as a genetics problem?

I believe the answer to this problem is 1/200 females are colorblind. I found the following on the internet: using the information below I determined an approximate incidence to be 1/192.

"Red-green color blindness simply means that a person cannot distinguish shades of red and green (usually blue-green). Their visual acuity (ability to see) is normal. There are no serious complications; however, affected individuals may not be considered for certain occupations involving transportation or the Armed Forces where color recognition is required. Males are affected 16 times more often than females, because the gene is located on the X chromosome."

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