What is not true of haemophilia?

The correct option is C Y-linked disorder

• It is called bleeder's diseases because haemophilia is a disorder in which a person's blood is not able to clot normally. In normal blood, proteins called clotting factors to work together to form a clot whenever bleeding occurs. The person with hemophilia lacks or doesn't have enough of a certain clotting factor so the blood can't make a clot.

• Haemophilia has been called a "royal disease". This is because the hemophilia gene was passed from Queen Victoria, who became Queen of England in 1837, to the ruling families of Russia, Spain, and Germany. Queen Victoria's gene for hemophilia was caused by spontaneous mutation.

• Hemophilia A and hemophilia B are inherited in an X-linked recessive pattern. The genes associated with these conditions are located on the X chromosome, which is one of the two sex chromosomes.

So, the correct answer is 'Y-linked disorder'