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Genetic Disorders: Haemophilia

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Haemophilia A is an X-linked recessive disorder and is caused by an inherited genetic mutation that is a permanent alternation in the DNA sequence which makes up a gene. This means that some of the body processes will not work in a normal way. The DNA molecule is packaged into a thread – like structure called chromosomes and they are responsible for carrying genetic information in the form of genes. There are two types of sex chromosomes: the X chromosome and the Y chromosome. All humans have a pair of sex chromosomes. Women have an XX pair and men have an XY pair. Girls inherit an X chromosome from each parent whereas boys inherit an X chromosome from their mother and an Y chromosome from their father. The chances of a child inheriting the

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