If a father and son are both defective in red-green colour vision, is it likely that son inherited t

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4.Principles of Inheritance and Variation

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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.

Option A

Option B

Option C

Option D

Solution

Gene for colour blindness is$X-$chromosome linked. sons receive their $\mathrm{X}$ 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.

Standard 12

Biology