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If a father and son are both defective i...

If a father and son are both defective in red-green colour vision, is it likely that the son inherited the trait from his father ? Comment.

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Gene for colour blindness is X-chromosome linked. sons receive their X from their mother, not from their father. Male-to-male inheritances is not possible for X-linked traits in humans. In the given case the mother of the child must be a carrier (heterozygous) for colour blindness gene.
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