HAEMOPHILIA
In the human body, each cell contains 23 pairs of chromosomes,
one of each pair 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. Females have XX
and males have XY. In addition to the information on sex, 'the X
chromosomes carry determinants for a number of other features of
the body including the levels of factor VIII and factor IX.'1 If
the genetic information determining the factor VIII and IX level is
defective, haemophilia results. When this happens, th…
