campbl25 - Geological Time Microevolution is Any time you...

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Geological Time
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Microevolution is… Any time you consider… natural selection genetic drift (within species) mutation gene flow between populations, or the randomness of mating within populations Indeed, all things up to and just about including the act of speciation itself …you are considering microevolutionary processes
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Macroevolution is… Any time you consider… the likelihood of births of new species (speciation events) the likelihood of the death of species (extinction) the adaptive radiation of lineages (birth of many species) mass extinction (death of many species) evolutionary relationships between species the evolutionary history of a lineage biogeography, or shared derived characters …you are considering macroevolutionary processes
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Caveats Note that the adaptation of a species to its natural environment (microevolution) will not necessarily have a positive impact on the ability of that species to give rise to descendant species (macroevolution)… That is, microevolution and macroevolution are not identical processes However, microevolutionary processes do impact on macroevolutionary processes For example, macroevolution is affected by the adaptations displayed by organisms (e.g., dispersal or dormancy ability) and adaptations are a product of selection (a microevolutionary process)
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Paleontology Paleontology is the study of the biology of the past
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Fossils
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Fossilization
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What can go Wrong… Fossilization : Start with dead organism Protect organism from air , e.g., by burying in sediments, by volcanic ash, in peat bogs, in tar pits, in tree sap Lack of erosion prior to mineralization Lack of geological distortion Reexposure to air Discovery by trained person Conclusion: Things with hard parts, that live in environments in which burying soon after death is likely, and are represented by large, long-lived populations will likely fossilize.
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campbl25 - Geological Time Microevolution is Any time you...

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