Sickle Cell Anaemia And Haemophilia: Sickle Cell Anaemia: It is an autosomal hereditary disease characterized by sickle-shaped (crescentic) red blood corpuscles under low oxygen content. It is caused by the substitution of valine for glutamine at the sixth position in the β chain of globin molecule of haemoglobin. The mutant haemoglobin molecule undergoes polymerization under