Lecture 02 - Thus populations evolve but individuals do not...

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BIOLOGY 1001: LECTURE 2 EVOLUTION BY NATURAL SELECTION HOMOLOGY - similarity by common descent VESTIGIAL TRAITS - homologous structure that is either rudimentary or no longer used CONVERGENT EVOLUTION - independent evolution of traits through similar selection pressures ANALOGY - similarity due to convergent evolution LaMarck's evolutionary theory: 1.Through use and disuse, structures change over an individual's lifetime. 2.These acquired characters are passed on to descendants. Darwin's theory of evolution by natural selection: 1.More individuals are born than can survive to reproduce. 2.Individuals vary in most traits 3.Individuals with certain traits are more likely to survive and reproduce 4.Variation is at least partly heritable
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Unformatted text preview: Thus, populations evolve, but individuals do not: a.Individuals inherit unmodified traits. b.Individuals carrying different heritable traits show differential survival and reproduction c.An increasing proportion of individuals carry the favorable trait in the next generation Evolution is the change through time in the proportion of individuals that possess a heritable trait; small-scale changes have extended over vast amounts of time to produce the diversity of life today. Levels of selection: 1.Populations evolve through the spread of traits that benefit the INDIVIDUALS that carry them 2.A trait's effect on the survival of a group or species is secondary to its effects on the individual that possesses it...
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