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8 Cards in this Set
- Front
- Back
Explain Gradualism & Puncuated equilibrium:
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Gradualism: Slow but steady accumulation of minor changes that leads to a new species.
Punctuated Equlibrium: Brief, sudden bursts of accumulation of change followed by long periods of no change & equilibrium. |
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Explain Anaenesis & Cladogenesis:
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Cladogenesis: 1) one part stays roughly the same.
2) 2 ver distinct groups with biological diversity as the gene pool is split => 2 separate species. Anagenesis: A gradual accumulation of genetic change that morphs species to look different and have different characteristics. The old generation does not exist anymore. |
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Explain the Alvarez hypothesis:
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An asteroid made of iridium hit the earth 65MYA, poisoning all the dinosaurs and making their prey go extinct as well as them.
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Explain the benefits of past mass extinctions:
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Brought on adaptive radiations.
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What are the 3 Driving Forces for extinction?
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Environmental Change, Habitat Destruction, Major Global Disruptions.
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Include an example for each driving force:
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Environmental Change:
New Competitor, Parasite, Herbivore, predator, disease. Habitat Destruction: Building homes, tearing down mainlands: Mountain Lions. Major Global Disruptions: Weather patterns: sunlight, temp, rainfall, etc. |
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Explain what the characteristics are that can predispose a population to extinction:
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Over specialization & Local distribution
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Explain what extinction is:
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Death of all members of a species.
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