evolution 4
ch 25
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| the evolutionary history of an organism | ||
| ordered array in which fossils appear within layers or strata of sedimen rock that mark the apssing of geologic time | ||
| Earth's history organized into four eras: Precambrian, Paleozoic, Mesozoic, and Cenozoic | ||
| the process of measuring the absolute age of geologic material by measuring the concentrations of radioactive isotopes and their decay products | ||
| Period of time which splits dating in half by measuring carbon 14 levels | ||
| the scientific study of diversity of organisms and their evolutionary relationships | ||
| a group of similar species | ||
| taxonomists assign to species two-part latinized name | ||
| second part of binomial | ||
| related genera | ||
| systematists use branching diagrams called ___________ _______ to depict their hypotheses about evolutionary relationships | ||
| phylogenetric diagram based on cladistics, phylogenetic tree constructed from a series of two-way branch points, suggesting ancestral relationships among species | ||
| made up of kingdoms | ||
| ALL descendants came from one common ancestor | ||
| a group of biological taxa or species that share features inherited from a common ancestor | ||
| first part of binomial | ||
| A homology common to a taxon more inclusive than the one being defined. | ||
| an evolutionary novelty unique to a particular clade | ||
| species or group of species that is closely related to the species we are studying | ||
| what we can begin building cladogram on | ||
| Only names clades | ||
| Evolutionary timing methods based on the observation that at least some regions of genomes evolve at constant rates. | ||
| perhaps the modern mammalian orders originated about 100 million years ago, but did not proliferate enough to be noticeble in fossil records til after dinos | ||
| theory about nature should be the simplest explanation consistant with facts |