Why is the color blindness gene still common in today's population?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Why is the color blindness gene still common in today's population?

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Color blindness: It is a genetic disease caused due to mutations on the X-chromosome. color blindness is caused by a fairly common X-linked recessive gene. Color blindness is more numbers in males than females as males have only one X-chromosome which expresses its character but in females presence of two X-chromosomes mutations in one chromosome is suppressed by second X-chromosome.

The difference in X-chromosome characters can be seen in the decreased number of light-sensitive cells found in the retina of the eye. These cells are called cones that sense wavelengths of light and enable the retina to distinguish between colors. 

 

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