Haemophilia is a sex-linked recessive disorder of humans. The pedigree chart given below shows the inheritance of haemophilia in one family. Study the pattern of inheritance and answer the questions given.
A blood test shows that the individual 14 is a carrier of haemophilia. The member number 15 has recently married the member numbered 14. What is the probability that their first child will be a haemophilic male?

Explanation

The probability of the first child being haemophilic male is 25%. (50% of the First Child being male and its 50% of becoming haemophilic `(XX^h xx XY)`.