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What is colour blindness?...

What is colour blindness?

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(i) Some people are unable to identify or distinguish certain colours due to the lack of cone cells in the retina.
(ii) This is a hereditary disorder and linked with X chromosomes.
(iii) This defect/disorder is called colour blindness and person is called colour blind.
(iv) It is mostly for the recognition of red and green colour.
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