2011 Lect 16 Evolution and selection

2011 Lect 16 Evolution and selection - uiz 3 Quiz 3 pens...

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Unformatted text preview: uiz 3 Quiz 3 pens Thursday March 3 rd 0am Opens Thursday March 3 , 10am Closes Friday March 4 th , 10am olution and Selection Evolution and Selection Darwin and selection Darwin was looking for a mechanism to explain ecies diversity species diversity He expanded from artificial selection and from observations in the wild eory of natural selection: Theory of natural selection: dividuals in a population vary 1. Individuals in a population vary phenotypically me variants fit better into their (current) 2. Some variants fit better into their (current) environment than others ose variants produce more offspring 3. Those variants produce more offspring 4. If genetic basis to variationthen ose alleles will increase in population over 5. Those alleles will increase in population over time l t i = evolution acterial selection and evolution after an Bacterial selection and evolution after an infection Evolution of resistance by selection eneration 1: 9% non resist % resist Generation 1: 99% non resist 1% resist Kills 90% of population, but not resistant ones Next gener: 90% 10% ow less effective: kills 80% but not resistant Now less effective: kills 80% but not resistant Next gener: 50% 50% esponse to selection Response to selection oth genotype and environment affect what a Both genotype and environment affect what a trait looks like....
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2011 Lect 16 Evolution and selection - uiz 3 Quiz 3 pens...

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