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Chromosome X&Y (23) – Colour Blindness



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How do we distinguish light from dark and one colour from another?

The answer lies in the tiny light-sensitive cells of our retinas — the rods and cones. We have three different types of cones which respond to blue, green and red light, and faults with any of these cone cells can lead to different kinds of colour blindness.

The gene responsible for colour blindness is found on the X chromosome which, as Dr Simon Watt explains, is the reason that so many more men are colour blind than women.

With thanks to BBSRC: http://bbsrc.ac.uk/

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23 thoughts on “Chromosome X&Y (23) – Colour Blindness
  1. Since women have two copies of certain rod genes, there are some cases of women who have tetrachromatic vision, which is sort of the opposite of color blindness. They can see 4 dimensions of color instead of 3.

  2. The green-blindness and blue-blindness visuals are mixed up. Blue-Yellow blindness would appear more red and the green blindness would appear more like the red blindness shown first.

  3. My best friend (female) is a bit colour blind. I remember we figured it out when thrift shopping once when we were teens. It explains why she kept getting in trouble at school for her clothes not adhering to the dress code — when it comes to darker colours, she really can't tell the difference.

  4. this is another baffling thing about the human body, why are our genes for colour vision on the X chromosome? why not on one of the others? It's more evidence against Intelligent Design; surely an Intelligent designer would have put the genes on one of the other chromosomes. Infact, why don't we have 4 sex chromosomes as a backup?

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