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Anthropology5_Mutations

Anthropology5_Mutations - Anthro5 18:00 They...

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Anthro 5  18:00 Mutations are errors in gene copying.  They: Provide the raw material for evolution. Create new alleles, which are inherent competitors/ Are random with respect to the direction of adaptation.  Thus evolution by natural selection is a two-step process: 1) The production (by mutation) of random alternatives (alleles, and the  proteins they specify). 2) The highly non-random sorting of these alternatives by natural selection What is selection’s criterion? The ability of the allele to get into the next  generation. Genes specify the recipes for proteins. Proteins interact with each other and with the environment in building the  phenotype. This lecture offers various ways of thinking about genotype-environment  relationships. Gene Action Useful to recognize two types of gene action: o 1. Obligate: resist environmental interference o 2. Facultative: monitor environmental variation and adjust phenotype 
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