A) Her mother and maternal grandfather were colour blind
B) Her father and maternal grandfather were colour blind
C) Her mother is colour blind and father has normal vision
D) Parents have normal vision but grandparents were colour blind
Correct Answer: B
Solution :
[b] Colour blindness is a common hereditary (inherited) condition which means it is usually passed down from your parents. A colour blind daughter therefore must have a father who is colour blind and a mother who is a carrier (who has also passed the faulty 'gene' to her daughter). If her father is not colour blind, a 'carrier' daughter won't be colour blind. A daughter can become a carrier in one of two ways she can acquire the 'gene' from a carrier mother or from a colour blind father. This is why red/green colour blindness is far more common in men than women.
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