Bio Evo Presentations Notes

Bio Evo Presentations Notes - Biology Evolution Class...

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Biology Evolution Class Presentations Notes 1. Parrots >> Warm Blooded/ Endothermic >> Basically evolved from therapod dinosaurs. >> First fossil bird is called Archaeopteryx (a dinosaur with feathers) >> Dichotomous key = a question that separates living beings into two groups. >> Archaeopteryx was a transitional form. >> A dinosaur with feathers or a bird with teeth? >> Phylogenetic tree – using homologous structures >> Cladogram – amount of difference in the DNA (mathematical measure) >> Mutations happen consistently (about every 100,000 years, with some exceptions) >> Paleontology – study of evolution >> Dispersion – when a group of organisms split into two or more groups (separated geographically which leads to divergence, then speciation) | P a g e Gautham – 3/22/2010
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Because each group is genetically isolated and is under different environmental stress (struggle to existence), they’ll diverge. >> Most parrots are green (to blend in with their environment) >> Vocalization must have evolved for warning signals, help fix struggle to survive.
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