BIO 200LLB Lecture Notes - Lecture 18: Antimicrobial Resistance, Insecticide, Allele

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Working in variation in population cause evolution. Genetic changes within a population which occur because human beings intentionally select for certain characteristics either by choosing which organisms to breed or eliminating undesirable individuals. Ex: breeding horses for the kentucky derby. Selection for increased speed by racehorses is no longer effective. Genetic changes within a natural (wild) population which occur because of differences in the reproductive success of some individuals over other individuals. Differences in mortality & reproduction lead to differences in the proportion of alleles passing to the next generation. Positive selection= a selective advantage for one allele and that favored allele increases in the population. Negative selection= a selective disadvantage for an allele and that tends to disappear from the population. A bunch of bacteria including a resistant bacteria. Get bathed in antibiotics, most of the normal bacteria die. The resistant bacteria multiply and become more common. Eventually, the entire infection evolves into a resistant strain.

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