Lecture 13

Lecture 13 - Lecture 13 History of Evolution o Prior to...

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Lecture 13 History of Evolution o Prior to 1800’s most people thought… All species were created at once and went unchanged (immutability of species) Spontaneous generation Refuting evidence Fossils Older earth Pasteur’s work o Lamarck’s evolution Species evolve Inheritance of acquired characteristics (use/disuse) o Darwin-Wallace Ideas Over-production of offspring Genetic variability Mutation Meiosis and fertilization Crossing over Environment selects for or against certain traits = natural selection, which caused a generation from generation (adaptation) Adaptation o Any heritable structure, process, function or behavior which enhances reproduction success more offspring into the next generation) Evolution is the change in gene frequency over time o A shift in the range of genetic variation o Brought about by genetic variability (mutation) and selection. Change is not always due to selection. Genetic drift is sometimes responsible
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Lecture 13 - Lecture 13 History of Evolution o Prior to...

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