319 MUTATIONS - MUTATIONS Gene mutation = a change in the...

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MUTATIONS Gene mutation = a change in the code transmitted by the m RNA from the gene to the ribosome. This changes the protein produced, resulting in the biochemical sequence being altered or stopped at this point. Therefore, the overall function of the gene may be changed , and the phenotype . Somatic mutations = mutations that occur in the somatic (body) cells and, thus, are NOT transmitted to the next generation. Most occur during the embryonic stages of development. The affected individual is different from either parent or siblings. Most affected individuals do NOT survive! Birth defects, caused by chemical or physical alteration of embryonic tissues, are somatic mutations. Some somatic mutations occur in ADULT animals, and may be part of the AGING process (liver spots, decreased skin strength, etc.) Some forms of CANCER may be a result of late life gene mutations. Sex cell mutations = mutations that occur in the gametes CAN BE transmitted to the offspring and become established in future generations. Mutated genes may show any and all types of gene action (dominance/recessiveness), lack of
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This note was uploaded on 01/16/2012 for the course ANSCI 319 taught by Professor Donhenneke during the Fall '11 term at Tarleton.

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