Biology 1002B Study Guide - Final Guide: National Center For Biotechnology Information, Trichromacy, Reading Frame
26 May 2016
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In multiple-choice style questions, identify: characteristics and predictions of the neutral theory of molecular evolution. At the molecular level, the majority of variation found between species is due to random genetic mutations that are neutral and have no effect on the protein. these mutations do not change the way the trait is selected upon. As time goes on, there will just be more build up of neutral mutations, creating more variation. Since neutral mutations seem to arise at a constant rate, and since selection doesn"t act on them, there is a build up over time. A mutation is called synonymous if it changes the nucleotide sequence but not the amino acid sequence. Mechanisms to explain how and why, over evolutionary time, lineages may lose and/or regain genes. If a trait is not needed/used or lowers the fitness of a species, over time, the train may lose the gene(s) for that trait. (man lives in trait, loses trichromatic vision)
