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7 Cards in this Set

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speciation in darwins finches
occurred by finding a new population, geographic isolation, changes in the new popualtions gene pool, repoductive isolation adn ecological competition
first step: founders arrive
species A flys or was blown to galapagos islands, may have gotten lost, but one there they managed to survive and reproduce
second step: separation of populations
some birds from species A corssed to another island and the two populations on each islands were isolated from each other and no longer share a common gene pool
third step: changes in the gene pool
popoulations on each islands became adpat to their environments
the plants on the first may have porduced small seeds whereas the ones on the second produced big seeds.
on first islands directional selection is favored by big beaks on second island and birds with large beaks would better surive and over time natural selction would casue populations to evolve larger beaks forming population B
step four: reproductive isolation
-birds from second cross to first island
birds with big beaks mate with mirds with big beaks and likewise with small birds
-the gene pools remain ioslated form each other
step 5: ecological competition
two new species live in smae environment they comepte for available seeds
-dry seans, individuals taht are most differnet have highest fitness
-species evolve that increases differnces between them
species B may evolve to species C
last step, number 6: continued evolution
this process porbably repeated itself adn created 13 kinds of species of finches