Antibody:

Antibody is a protein produced by white blood cells that help to destroy bacteria. Antibodies react with the antigens and inactivate or destroy them. A large number of antibodies are produced in blood which are targeted against various types of antigens. Antigens are foreign molecules, cells, bacteria, viruses or fungi which enter the body usually a disease causing microorganisms. Antibodies are the integral part of the defence mechanism of human body. They are also involved in immunity against disease.

Hemophilia:

• It is a disease in which the peron have prolonged blood clotting time resulting in excessive bleeding fron injury.
• It is due to the deficiency of vitamin K.
• It is a semilethal disease controlled by recessive gene.
• It is less common in women than in men.