BIOL 2200 Chapter Notes - Chapter 22: Pharyngeal Arch, Vestigiality, Soapberry
21 Jan 2017
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Chapter 22: descent with modification: a darwinian view of life. 22. 3 evolution is supported by an overwhelming amount of evidence. Direct observations of evolutionary change: natural selection in response to introduced species. Animals have adaptations that help them feed on their food sources. Soapberry bugs and their beaks in south florida differ from those in. Central america because of different food sources: evolution of drug resistant bacteria. Overuse of penicillin as antibiotic led to increase in penicillin-resistant strains of bacteria. New antibiotics created, as well as new resistant strains. Homology: characteristics in ancestors change over time as they face different environmental conditions, homology similarities resulting from common ancestry, anatomical and molecular homologies. Forelimbs of all mammals are similar even though used for a variety of different functions. Example of homologous structures different structures based off of common ancestor. At some point, all vertebrate embryos had a tail and pharyngeal arch.
