Beginning of Essay
In the human body, each cell contains 46 chromosomes and 23 pairs of chromosomes, one of each pair is inherited through the egg from the mother, and the other inherited through the sperm of the father. Of these chromosomes, those that determine sex are X and Y. ....

Middle of Essay
.... of cases, this protein is present by immunoassay but defective. B, the other type of , is a result of the deficiency of the factor IX - also known as Christmas disease. This protein deficiency of causes the blood to not be able to form a firm clot, and there a person who gets bruised or cut, keeps on bleeding. Not more, but longer. There are also other blood clotting disorders such as von Willebrand disease which can affects both sexes. is the most common hereditary blood disorder, affecting approximately one in ten thousand people, almost all male. People with suffer from abnormal blood clotting. In c's, clotting cannot occur and bleeding is ....