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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 linked with $\mathrm{X}$-chromosome and son receive its $\mathrm{X}$-chromosome from his mother, not from his father or X-linked traits in humans, male to male inheritances is not possible.
In the given case the mother of the son must be a carrier (heterozygous) for colour blindness gene, thus transmits the gene to her son.
In the given case the mother of the son must be a carrier (heterozygous) for colour blindness gene, thus transmits the gene to her son.
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