Both husband and wife have normal vision though their fathers

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Both husband and wife have normal vision though their fathers were colour blind. The probability of their daughter becoming colour blind is

1. 0%
2. 25%
3. 50%
4. 75%

Correct Option: A

The probability of the daughter becoming colour blind arises only when the father is also colour blind.

So, probability of their daughter becoming colour blind is 0%.