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A colour blind girl is rare because she will be only when :A. her mother and maternal grandfather were colourblindB. her father and maternal grandfather were colourblindC. her mother is colour blind and father has normal visionD. parents have normal vision but grand parents were colourblind

Answer» Correct Answer - B
For a girl to be colourblind, the genotype of her father should be `X^(C )Y` and of her mother either `X^(C )X` or `X^(C ) X^(C )`, where `X^(C )` represents colour blind gene.


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