It is a sex linked inheritance found in human beings. Persons suffering from colour blindness have difficulty in distinguishing red from green. It is rather common trait and more common in males. It is because Y chromosome is inert for this trait. Only one gene of this trait will render a colour blind man. While on the other hand a woman must have two genes for this trait to become colour blind.
This trait of colour blindness can easily be detected by using special charts made up of a number of coloured dots so arranged that colour blind person sea different pattern than other persons do.
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