BIO 124 Chapter Notes - Chapter 14: Homeotic Gene, Body Plan, Brine Shrimp
9 Mar 2016
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Macroevoluion: broad patern of evoluion on a species level. Ex: key adaptaions & their origins: like light in birds. Fossil record - strata (sequence in which fossils accumulate in sedimentary rocks) o o. Fossils can include insects preserved in amber or mammals frozen in ice. Radiometric daing: based on decay of radioacive isotopes in half-lives (ime for a parent isotopes to decay into a daughter isotope = 50% of the parent isotope) Can use any element but carbon-14 is most common. Half-life is not efected by temperature, pressure, environmental factors. Fossils have isotopes present of when the organism was alive. Carbon can only be used up to 75,000 years ago. Geologic record: standard ime scale that divides earth into 4 eons & many subdivisions o o o o. Earliest life as seen in stromatolites (layered rocks formed by prokaryotes creaing bioilm on sedimentary rock)
