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Unformatted text preview: ene can occur. one of the most common causes of genetic changes. As our bodies
age, our cells need to be continually replaced: the cells (and their
Sometimes mistakes occur in this copying process, and changes in
the genes build up in our cells.
Other changes to genes do not seem to make any difference
to the way the message is read or to its meaning to the cell. different ways
these ‘neutral’ gene changes can sometimes be associated with
three different proteins
is more than the number of genes Our bodies have many different types of cells such as those in the
skin, muscle, liver and brain.
genes, each cell requires particular proteins to function
correctly schizophrenia (Genetics Fact Sheet 58).
Some gene changes make the gene faulty so that the message
is not read correctly or is not read at all. A change in a gene that
makes it faulty is called a mutation. A faulty (mutated) gene may
cause a problem with the development and functioning of different
body systems or organs and result in a genetic condition (see cause no problem
Importantly, some faulty (mutated) genes may not cause any cell cells have different functions and therefore require different genes
to be active.
Some genes are only switched on during the development of
the baby. After birth they are no longer needed to be active as
their ‘job’ has been completed. may be in these cells because that person inherited it from one
or both parents. Sometimes, however, a mutation can occur for
unknown reasons in an egg or sperm cell and may cause a genetic
condition. An individual conceived from that egg or sperm cell
then be passed down to his or her children and future generations. discuss changes to the genetic code in more detail. Other Genetics Fact Sheets referred to in this Fact Sheet: 2, 4, 5, 8, 9,
10, 11, 12, 14, 22, 24, 58 www.genetics.edu.au The Australasian Genetics Resource Book – © 2007 5 FACT GENES AND CHROMOSOMES 1 Information in this Fact Sheet is sourced from:
Practical Genetic Counselling. London: Arnold.
Amer J Hum Genet, Edit history
th Ed) Acknowledgements this edition: Gayathri Parasivam 6 The Australasian Genetics Resource Book – © 2007 SHEET www.genetics.edu.au...
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