BIO220H1 Lecture 7: BIO220 (Winter 2014) Lecture 7

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14 Mar 2016
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BIO220H1 Full Course Notes
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The larval stage larva feed on plankton in the water, and emerge out of the pupal stage form the water: to stop the larval stage remove water (e. g. baths) it is required for eggs. Favouring the resistance allele; killing those with non-resistance allele. Individuals also moving across boundary and carrying resistance allele in the spray zone. After 1990s, frequency declines rapidly: confirms that the pesticide is selecting for the resistance allele, since frequency decreasing it suggests cost to resistance. In absence of favouring the allele through spraying, disfavoured vs. the non-resistance allele explains why resistance alleles are rare in absence of selection. The antibiotic, penicillin discovered by 1929 by sir alexander fleming: antibiotics kill bacteria by disrupting a variety of biochemical processes, major life saver for humans. For bacteria they are a major force of selection: susceptible genotype killed by antibiotic, resistant genotypes survive, therefore - antibiotic use amounts to a selection experiment.

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