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Of both normal parents, the chance of a male child becoming colour blind are
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- no
- possible only when all the four grand parents had normal vision
- possible only when father’s mother was colour blind
- possible only when mother’s father was colour blind
Correct Option: D
On crossing carrier colour-blind woman with a normal man, the sons become colour blind. This is an example of criss cross inheritance. The genes for colourblindness is coming from mother's father.
