EXAM 4 - EXAM 4 19:32 Chapter 14 Principles of Evolution...

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Unformatted text preview: EXAM 4 19:32 Chapter 14 Principles of Evolution What is Evolution? Evolution Change in the proportion of genotypes in a population over time With time measured in generations Descent of modern organisms with modification from preexisting organisms Misconceptions About Science and Evolution Scientists PROVE things Evolution is just a theory Science vs. Religion Intelligent Design is a scientific theory Exploration of new lands = staggering number of species Similarities among species led to thoughts that they could change Similar species are descended from a common ancestor Fossil discoveries showed that life had changed over time Cuvier - catastrophism Catastrophes caused extinct species and strata Where were fossils of species that are around today? Agassiz new creations 50 different creations? LeClerc Creation of small number of organisms which evolved over time Over time said Earth 4,000-6,000 years old, not enough time Geologists showed that the Earth is old Hutton and Lyell Uniformitarianism slow natural forces (wind, water, earthquakes, volcanoes) caused stratification of rock Observations of geological formations x rates processes occur = Earth at least millions of years old Plenty of time for evolution, but still need a mechanism Pre-Darwinism Theory of Evolution Lamarck Inheritance of acquired characteristics Bodies of living organisms are modified through the use or disuse of ports These modifications are inherited by offspring The idea turned out to be wrong Evolution by Natural Selection Darwin and Wallace developed the theory independently Darwin voyage of the Beagle Wallace naturalist in Indonesia Darwins Finches Figure 14-4 How Does Natural Selection Work? Natural Selection The unequal survival and reproduction of organisms due to environmental forces, resulting in the preservation of favorable adaptations Process selects from what is available in the gene pool New genes are not created on demand Mechanism Behind Natural Selection Figure 14-5 A population of deer was threatened with overpopulation until cheetahs were imported. After a couple of generations, there were fewer deer, but the average running speed of the deer had increased. This is an example of Natural selection The theory of natural selection states that ___. The best adapted individuals survive and reproduce, contributing the most genes to the next generation How Do We Know That Evolution Has Occurred?...
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EXAM 4 - EXAM 4 19:32 Chapter 14 Principles of Evolution...

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