BSC2010 Ch16 Genes and Chromosomes Easy Fact Sheet

One of the most common causes of genetic changes as

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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 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. enomics Amer J Hum Genet, Edit history th Ed) Acknowledgements this edition: Gayathri Parasivam 6 The Australasian Genetics Resource Book – © 2007 SHEET
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This note was uploaded on 10/30/2012 for the course BSC 2010 taught by Professor Smith during the Spring '08 term at University of South Florida - Tampa.

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