Question

The human male never passes on the gene for red - green colour blindness to his son. How is it so ? ​

Answer 1

Answer:

Red/green colour blindness is passed from mother to son on the 23rd chromosome, which is known as the sex chromosome because it also determines sex. So, for a male to be colour blind the faulty colour blindness 'gene' only has to appear on his X chromosome.

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Answer 2

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A són is børn only when father pasßes Y chromosome and it is known that the genes respónsible for çolour blindness are present in X chromosome. Therefore, a fàther can never pàss gènes responsible for colour blindness to his són.

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