Which of the following is least probable? 

(1) Female child with Sickle cell anaemia

(2) Male child with haemophilia

(3) Carrier female for haemophilia

(4) Female child with haemophilia

A colour blind girl is rare because she will be born only when 

(1) Her mother and maternal grand father were colour blind

(2) Her father and maternal grand father were colour blind

(3) Her mother is colour blind and father has normal vision

(4) Parents have normal vision but grand parents were colour blind. 

A female whose father was colorblind marries and normal male whose father was also colorblind. What is the probablility that their daughter will be colorblind?

1. 0 %

2. 25 %

3. 50 %

4. 75 %