Bio; Lecture 07; Evolution--Population Genetics

Bio Lecture 07; - Misconceptions about Evolution Misconception Humans are the pinnacle of evolution o We are one of the most recently evolved

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Misconceptions about Evolution Misconception: Humans are the pinnacle of evolution o We are one of the most recently evolved species o However, humans are only part of a great diversity of living organisms o Evolution has no ultimate goal or purpose, it is random o Evolution is random, and has no direction Evolution happens during the lifetime of an individual o Natural selection acts on the individual o However, evolution can only be seen on the population over time after generations Phenotypic changes acquired during a lifetime can be passed on to the next generation o Proposed by Lamark: giraffes end up with long necks because during their lifetime they stretch to reach tall trees, passing on their newly stretched necks to their offspring o Traits acquired during a lifetime are not heritable. Evolution is slow; takes millions of years for evolution to take place o Critics say that if you can’t see it, it doesn’t exist o However, you can’t see gravity, yet we know it exists o Evidence that evolution by natural selection can be relatively fast: Cichlids in Lake Victoria Lizards in islands Bacteria have evolved antibiotic resistance within the past 59 years New strains of HIV develop in patients only after a month after
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This note was uploaded on 05/26/2008 for the course BIO 103 taught by Professor Potts-santone during the Spring '07 term at Northeastern.

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Bio Lecture 07; - Misconceptions about Evolution Misconception Humans are the pinnacle of evolution o We are one of the most recently evolved

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