Both husband and wife have normal vision though their father were colour blind and mother did not have any gene for colour blindness .The probability of their daughter becoming colour blind is :

Options

A. `0%`
B. `25%`
C. `50%`
D. `75%`

Answer

A

Explanation

In this case when the fathers of both husband and wife were colour blind and they have normal vision, husband have normal vision while wife is carrier of this disease.
Daughter of such parents will be carrier but there is no chance of her to be colour blind.