Normal color vision- color blindness, Biology

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If a color blind man marries a woman pure for normal color vision, it's probable that one of the below situations may result. Is it possible that

a) All the children would be color blind

b) All the grandchildren will be color blind

c) Only the sons will be colour-blind

d) Half the grandsons will be color blind

Answer: d -- half the grandsons will be color blind

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