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Disease-Spotlight: Color Blindness

Today’s spotlight is not actually a disease, but a disorder most often caused by affected genes on the X chromosome.

A quick flashback to the magic that was 8th grade science: a human male receives an X chromosome from mom, and a Y chromosome from dad. A human female receives an X from mom and an X from dad. Color-vision is an X chromosome-linked trait, meaning the mutation happens on the X chromosome. 

If you remember, a dominant, correct gene will always mask a recessive, faulty gene. 

It follows from these bits of information that females will be less likely to be color-blind, because they receive two copies of the X chromosome–even if one copy is bad, the other is likely to be good, and the good is the trait that will prevail. Males only have one X chromosome, so if the gene(s) for color-vision are present (genotype), there is nothing to stop it from presenting as a trait (phenotype). 

Indeed, research indicates that about 5% (and possibly as high as 8%) of males are color-blind to some degree, while only 0.5% of women are color-blind. Interestingly, there is an idea that a recessive gene characteristic that exists in 5% or more of a population, it may mean that characteristic have some sort of evolutionary advantage in the long-term. Often, color-blind individuals are able to distinguish camouflage patterns from their backgrounds more easily, which certainly may be an evolutionary advantage! 

Wall Street Journal (online) posted an excellent article about color-blindness that I want to refer you to. The article contains great information, interactive graphics that allow you to see what the world looks like with various types of color blindness, a video, and even a comments-section full of interesting stories! To get to that article, click on the following link:

Wall Street Journal color-vision article

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Nashville Location

Visit our Nashville office, located in the Belle Meade Hill Center.

  • 4322 Harding Pike Suite 214
  • Nashville, TN 37205
  • Monday7:30 AM - 5:00 PM
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  • 1715 West Main St. Suite 100
  • Lebanon, TN 37087
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Visit our Lebanon office in Lebanon Center, just off Main Street.

  • 1715 West Main St. Suite 100
  • Lebanon, TN 37087
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Our Lafayette office is located on the square by Macon Helps. We are proud to serve the surrounding areas including Red Boiling Springs, Hartsville, and Westmoreland.

  • 105 Main Street
  • Lafayette, TN 37083
  • Monday1:00 PM - 5:00 PM
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Lafayette Location

Our Lafayette office is located on the square by Macon Helps. We are proud to serve the surrounding areas including Red Boiling Springs, Hartsville, and Westmoreland.

  • 105 Main Street
  • Lafayette, TN 37083
  • Monday1:00 PM - 5:00 PM
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  • 715 E. McMurry Blvd.
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Hartsville Location

Our Hartsville office is located at the corner of McMurry Boulevard and Driver Circle.

  • 715 E. McMurry Blvd.
  • Hartsville, TN 37074
  • Monday8:00 AM - 5:00 PM
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Hendersonville Location

Our Hendersonville office is conveniently located across the street from the new City Hall. We are pleased to serve Sumner County and all the surrounding areas.

Please Note: The office closes from 12-1 every day for lunch.

  • 313 E. Main St. Suite 4
  • Hendersonville, TN 37075
  • Monday8:00 AM - 5:00 PM
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Hendersonville Location

Our Hendersonville office is conveniently located across the street from the new City Hall. We are pleased to serve Sumner County and all the surrounding areas.

Please Note: The office closes from 12-1 every day for lunch.

  • 313 E. Main St. Suite 4
  • Hendersonville, TN 37075
  • Monday8:00 AM - 5:00 PM
  • Tuesday9:00 AM - 5:00 PM
  • Wednesday8:00 AM - 5:00 PM
  • Thursday9:00 AM - 5:00 PM
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  • SaturdayClosed
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