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8 Cards in this Set

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Explain Gradualism & Puncuated equilibrium:
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.
Explain Anaenesis & Cladogenesis:
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.
Explain the Alvarez hypothesis:
An asteroid made of iridium hit the earth 65MYA, poisoning all the dinosaurs and making their prey go extinct as well as them.
Explain the benefits of past mass extinctions:
Brought on adaptive radiations.
What are the 3 Driving Forces for extinction?
Environmental Change, Habitat Destruction, Major Global Disruptions.
Include an example for each driving force:
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.
Explain what the characteristics are that can predispose a population to extinction:
Over specialization & Local distribution
Explain what extinction is:
Death of all members of a species.