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) Give all the possible genotypes of the members 4, 5 and 6 in the pedigree chart.
(b) A blood test shows that the individual 14 is a carrier of gaemophilia. The member numbered 15 has recently married the member numbered 14. What is the probability that their first child will be a haemophilic male ? Show with the help of Punnett square.

Explanation

(a) Member 4= Female =22 XX
Member 5 = Affected male =22 +`X^(h)Y`
Member 6= Male = 22 XY
(b) Member 14 is a carrier female `(XY^(h))` who got married with 15 (XY). A cross between two results

The prabability is 25% haemophilic male.