Question

Consider the information given below about a family and answer the questions that follow. • Rafiq, a ten year old boy, injured himself badly during the games period in school. He was rushed to a nearby hospital as the bleeding could not be stopped despite the first aid given to him. • His uncle had lost his life in a similar condition. • Rafiq's entire family underwent a genetic analysis to detect Bleeder's disease. His parents, sister Farah and paternal grandmother were tested to detect the disease. • Rafiq's mother and grandmother were found to be carriers of the Bleeder's disease.

Student to attempt either option-(A) or (B) :

A normal couple produces half the sons as haemophilic and half the daughters as carriers. Choose the option that correctly indicates the chromosome on which the gene for this trait is located.

Why are human females rarely haemophilic ? Explain with the help of a cross. Under what conditions can a haemophilic female be born ? How do haemophilic patients suffer ?