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Unformatted text preview: for enzyme 2 prevents the expresson of the locus for enzyme 1. Genomic Imprinting sometimes an allele is expressed differently if it is inherited from the mother than if it is inherited from the father. Example: Huntington's disease is expressed earlier if inherited from the father. The symptoms of Huntington's disease are caused by a slow deterioration of brain cells that begins at middle age. It is characterized by involuntary jerking movements of the body including facial muscles and slurred speech. Later, there is difficulty swallowing, loss of balance, mood swings, impaired reasoning, and memory loss. The person eventually dies, usually to pneumonia or heart failure. Polygenic Inheritance A polygenic trait is due to more than one gene locus. It involves active and inactive alleles. Active alleles function additively....
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This note was uploaded on 12/15/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.
- Fall '10