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Question

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

A
all colour blind
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B
all normal visioned
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C
one half colour blind and one half normal
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D
¾ colour blind and ¼ normal
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Solution

The correct option is A all colour blind
Colour blindness is caused due to the inheritance of mutant alleles present on the X chromosome which hinders normal colour vision in the affected person. Based on the information provided in the question, the woman is colour blind (genotype XcXc) and the man has normal vision (genotype- XY). The following Punnett square can be used to represent the cross between the two parents.


According to the result obtained in the Punnett square, all the sons are colourblind.

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