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Question

If a colourblind woman marries a normal visioned man, their sons will be

A
All normal visioned
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B
One-half colourblind and one-half normal
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C
Three-fourth colourblind and one-fourth normal
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D
All colourblind
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Solution

The correct option is D All colourblind
Colour blindness is a X-linked recessive disorder. One copy of the affected gene in males in each cell is sufficient to cause the disorder (XcY). Females with two copies of the affected gene show the disorder (XcXc). Females heterozygous (XcX) for this trait be normal but serve as a carrier of the disease. According to the question, the female is colour blind (XcXc) and father is normal (XY). The affected mother will inherit the disease to all sons (XcY). Correct answer is option D.
Parent generation : (XcXc) x XY
Gametes
(XcXc) -->
XY
Xc
Xc
XXcX
carrier girl

XcX
carrier girl
YXcY
colour blind boy
XcY
colour blind boy


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