Cystic fibrosis
Genes in our chromosomes can sometimes cause alterations in there information. This is called gene mutation. This is caused when cells are ageing or when cells have been exposed to chemicals or radiation. Most of the time the cells recognise these mutations and repair themselves. However other times they stay and cause illness and disorders. If the mutations occur in the sperm or egg cells, children could inherit the disorder. This happens when the mutated gene is inherited from the parent. This is called a genetic disorder. There are more than 4000 diseases caused by genetic mutations. Having a diseased gene does not mean that it will be present in your phenotype. Because we inherit a gene from each parent having one diseased gene does not mean that you will actually have the disease because the normal gene will allow your body to act perfectly normal. On average a person may carry 5-10 mutated genes in there cells. Disorders appear when the mutated gene is dominant or when the mutated gene is present in both chromosomes. Problems also occur when the mutated genes interact with one another or with environment. If a person carries a dominant mutated gene he or she will usually have the disease. The person’s children will have a
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Approximate Word count = 1421
Approximate Pages = 6 (250 words per page double spaced)
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