01:070:102 Lecture Notes - Lecture 4: Pesticide Resistance, Mate Choice, Melanism
17 Oct 2016
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Document Summary
Evidence of natural selection: under field conditions, selection pressures are shown to vary, and they vary quickly, phenotypes may alter quickly in response. Natural selection in the field: reduction in the frequency of the melanistic morph from 80% to 5% within a decade. Natural selection in the wild: frequency of pesticide resistance in mosquitoes increases after pesticides are administered, similar to origins of drug resistance in pathogens after antibiotics are administered. Science, sept 9 2016: harvard medical school publishes the result of a 2 week experiment on microbial resistance to antibiotics, medical students skeptical about the value of studying evolution, so faculty develop a visual demonstration. Genetic analysis of living humans shows that we are the products of modern human ancestors. Since 1859, many alternatives have been sought for natural selection because. Given high selection pressures, complex structures evolve quickly.
