Bio3

Front 1

speciation in darwins finches

Back 1

occurred by finding a new population, geographic isolation, changes in the new popualtions gene pool, repoductive isolation adn ecological competition

Front 2

first step: founders arrive

Back 2

species A flys or was blown to galapagos islands, may have gotten lost, but one there they managed to survive and reproduce

Front 3

second step: separation of populations

Back 3

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

Front 4

third step: changes in the gene pool

Back 4

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

Front 5

step four: reproductive isolation

Back 5

-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

Front 6

step 5: ecological competition

Back 6

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

Front 7

last step, number 6: continued evolution

Back 7

this process porbably repeated itself adn created 13 kinds of species of finches