Lecture 5-October 08, 2009

Lecture 5-October 08, 2009 - Lecture 5 1. Mutations are...

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Lecture 5 1. Mutations are errors in gene copying a. They: i. Provide the raw material for evolution ii. Creates new alleles, which are inherent competitors iii. Are random with respect to the direction of adaptation 2. Thus evolution by Natural Selection is a two step process a. The production (by mutation) of random alternatives (alleles, and the proteins they specify) b. The highly non-random sorting of these alternatives by natural selection 3. What is selection’s criterion? The ability of the allele to get into the next generation a. Genes specify the recipes for proteins b. Proteins interact with each other and with the environment in building the phenotype c. This lecture offers carious ways of thinking about genotype-environment relationships 4. Gene Action a. Useful to recognize two types of gene action: i. Obligate-resist environment interference ii. Facultative-monitor environmental variation and adjust phenotype accordingly 1. Obligate variation can be either a. Discrete-just two or a few values (e.g. height in Mendel’s peas)
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Lecture 5-October 08, 2009 - Lecture 5 1. Mutations are...

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