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If a colorblind man marries a normal woman without any history of colorblindness in her family, then their sons will be

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one-fourth colourblind and one-half normal

one-half colourblind and one-half normal

all colourblind

all normal-visioned

answer is D.

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Detailed Solution

Colourblindness is an X-linked recessive disorder. It follows crisscross inheritance where it is passed to grandsons through the daughter. It cannot be passed to the sons and hence are normal visioned.

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