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Biol 121- 2010.03.08- Evolution- Evidence for Evolution (Ch. 24).docx

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University of British Columbia
BIOL 121
Carol Pollock

Biol 121 225 Freeman 484490Mar 8 10 Evolution 2 Ch 24 Evidence for Evolution Main points of Darwins theory 1 Evolutiondescent with modification all organisms have a common ancestorLinnanean hierarchy tree of life two species in a family are more closely related than those in different families in the same class the environment changes traits in a population over timeover generations allele frequency changes in a population2 Natural selectionthe mechanism of evolution Premises genetic variation exists performance affects reproductive successhigher fitness competitiondifferential survivalnatural selection occurs through interaction between environment and existing genetic variation in a population it causes a change in the population resulting in increase in those better suited for survival variable population because of adaptation of population to environmentvariationselectionadaptation Evidence for evolution the fossil record 1 Evidence for change through extinct species can be noticed in fossils containing shells bones leaves bird tracks time dung etc a Fossil record this was used as evidence by Darwin who then said that species were not static i Extinctions immutable entities his reasoning since species have gone extinct array of species living o
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