Principle of Inheritance and VariationMedium
Question
A colourblind girl is rare because she will be born only when
Options
A.her mother and maternal grandfather were colourblind
B.her father and maternal grandfather were colourblind
C.her mother is colourblind and fatherhas normal vision
D.parents have normal vision but grand parents were colourblind
Solution
For a girl to be colourblind, the genotype of her father should be XCY and of her mother either XCX or XCXC, where XC represents colourblind gene.
In the diven options this is only possible when her father and maternal grandfather were colourblind.
In the diven options this is only possible when her father and maternal grandfather were colourblind.
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