Study Guide�Exam1 Bio

Study Guide�Exam1 Bio - Study Guide.Exam1 Bio The...

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Study Guide…Exam1 Bio 09/02/2008 15:46:00 The fossil Reord: Importance of fossils for study of evolution- o Evolution- (1) modern organisms differ from recent fossil organisms.  (2) Pathogens change from antibiotic sucestible to antibiotic resistant.  (3) Sepcies have gone extinct in our lifetimes. (4) Evolution is a  description of the fact that species and their characteristics change  over time. (5) Natural Selection is a theory that provides hypotheses  about why and how these changes have occurred.  o Importance of fossils- (1) Fossil are the preserved remanants or  impressions left by organisms that lived in the past. (2) Fossils help  establish relationships between living organisms because they reveal  ancestral characteristics that may have been lost over time in certain  lineages.  What are Fossils? o Fossil record- ordered array in which fossils appear within sedimentary  rocks.  o Sedimentary Rocks- different layers form at different times. Strata-  sequential layers of material (1) Rivers carry sediment rock to the  ocean. Rock layers then form on the ocean floor. (2) Over time new  strata are deposited, containing fossils from each time period. (3) As  the sea levels change and sedimentary rock is pushed forward, the  rocks become exposed. Erosion then reveals strata and fossil.  o Trace fossils- rementas of ancient organisms or activities. Ex)  footprints. Limitations of the fossil record o Fossil record is incomplete- slanted in favor of species that had shells  or hard skeletons. A large # of earths species probably did not die in  the right place at the right time to be captured in fossils; of those fossils  that were formed many were probably destroyed by later geologic  processes; and only a fraction of existing fossils have been discovered.  System of classification- see notes or figure 25.8 in book Taxonomy- the naming and classification of species and groups of species.  Ex) Finding a new species nad giving them names (as in the previous figure)
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Binomial nomenclature- (1) Common names for organisms which convey a meaning in causal usage. (2) binomial- the two-part Latinized name of a species, consisting of genus and specific epithet. (3) genus- a taxonomic category above the species level, designated by the first word of the species’ two part scientific name. (3) specific epithet- referring to one species within a genus. How species are found, described and named?
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Study Guide�Exam1 Bio - Study Guide.Exam1 Bio The...

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