Apuntes
Evidence for evolution and mass extinction
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Mass extinction
o
which
many species become extinct over a relatively short period of time
o
Entire ecosystems vanish
o
Causes: asteroid, volcanic eruptions, moving
continents, changing sea level
o
New opportunities to survivors
Speciation: formation of new species
o
Causes
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Reproductive isolation
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Behavioral isolation
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Geographic isolation
§
Temporal isolation
o
Darwin’s Finches
Evidence for Evolution
Fossils
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Preserved remains or traces of ancient organisms
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Some fossils of extinct animals are similar to
living species
Anatomy and Embryology
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Homologous structures: structures that are
shared by related species and that have been inherited from a common ancestor
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Analogous structures: body parts that share
common function, but not structure
DNA
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The universal genetic code = evidence of common
descent
Differential Reproductive Success
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Información
- Descripción
- Apunte sobre Sin título, creado por K. Avery el 27/09/2014.
- Creado por
- K. Avery
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- Valoración
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