BIO 311D Lecture Notes - Lecture 30: Pesticide Resistance, Antimicrobial Resistance, Soot
Document Summary
Bio 311d, dr. donald levin, lecture #30, 10 april 2017 (all images are taken from dr. levin"s lecture slides, which are available on his website http://www. sbs. utexas. edu/levin/bio311d/) Selection is always done on the phenotype because a breeder wouldn"t know an individual"s genotype. Agent of selection what drives selection by choosing which individuals live or die: for peppered moth: the birds eating the moths. Dark phenotype become favored in the environment because of the soot- covered tree trunks: for pesticide resistance: the pesticide, for antibiotic resistance: the antibiotics. Selection against melanism (dark or light: gradually decreased from 1959 to 1995 because environmental regulations helped lichens grow again and make dark moths more conspicuous. Relative fitness how good the other genotypes are relative to the best: example1: aa genotypes had 1000 offspring, aa had 500 offspring, and aa had only 200 offspring. Because aa produced the most offspring, it"s the most fit genotype.
