Chapter 22 SG - Chapter 22 Charles Darwin made 2 major points from his book The Origin of Species a many species are descendants of ancestral

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Chapter 22 Charles Darwin- made 2 major points from his book, The Origin of Species a. many species are descendants of ancestral species that were different from modern species b. proposed the mechanism for evolutionary process known as natural selection c. Along with the two points, Darwin had two main ideas from his book 1. that evolution explains life’s unity and diversity 2. that natural selection is a cause of adaptive evolution Evolutionary Adaptation- an accumulation of inherited characteristics that enhance survival; results from natural selection Evolution- change in genetic composition of a population over time; over time, enough change can accumulate to create new species Aristotle- believed that species are fixed (unchanging) and arranged on hierarchal ladder of complexity that differentiated the uniquely perfect characteristic of different species; coincided with Old Testament, God’s design of perfection Linnaeus- classified diverse species “for the greater glory of God”; created taxonomy classes Cuvier- paleontologist (studied fossils) and found that the deeper the strata, or sediment layer, the more different the structure a. Sedimentary Rocks- rock layer formed from sand and mud where most fossils reside; may have different strata (layers) b. Catastrophism- opposed gradual evolution theory; assumes a catastrophe eliminated certain species per strata (i.e. flood) Hutton- geologist supporting gradualism with geologic evidence of rising mountains (plate shifts), eroding rivers (strata revealed) a. Gradualism- slow but continuous change occurs in time Lyell- geologist incorporating Hutton’s ideas to form uniformitarianism , or that geologic changes in past occurs at
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This note was uploaded on 08/27/2010 for the course BIO 8432 taught by Professor Lang during the Spring '10 term at Northwestern IA.

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Chapter 22 SG - Chapter 22 Charles Darwin made 2 major points from his book The Origin of Species a many species are descendants of ancestral

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