Chapter 22

Chapter 22 - Chapter 22-1/20/10 Descent with modification...

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Chapter 22-1/20/10 Descent with modification… What is evolution and adaptation? 1.) Change over time of the genetic comp of a population 2.) Decent of modern organisms with modification from preexisting organisms Evolutionary adaptation -Accumulation of inherited characteristics that enhance organisms’ ability to surive in specific environments. Pre-Darwinian Theory of Evolution Lamark -Inheritance of acquired characteristics -Bodies of living organisms are modified through the use of disuse of parts -These modifications are inherited by offspring -This idea turned out to be wrong Evolution by Natural Selection Darwin and Wallance developed the theory independently. -Darwin- voyage of the Beagle -Wallace- naturalist in Indonesia 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 characteristics are not created on demand. (pg458 flow chart on their observations) 1/22/10 CHP 22…. Think about the 100-m dash track and field competition. How can we change this race to reflect the process of natural selection? -having tiger chasing them, changing environment… Artificial Selection: -Selective breeding of organisms to encourage the occurrence of desirable traits. (-humans are responsible for artificial selection) -analogous to natural selection
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( fig1 chp22.9) Concept 22.3= Evolution is supported by an overwhelming amount of scientific evidence. Examples of Natural Selection: ( fig 22.13)
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( fig 22. 14) Natural Selection & HIV Resistance.
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(fig 22.15) Fossil Record: -Show change in organisms through time.
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-Change in types of organisms - past organisms differ from present-day organisms. -many species have become extinct. (fig 22.16) -darwinitist rarely mention the whale because it presents them with one of their most insoluble problems. They believe that some how a whale must have evolved from an ordinary land-dwelling animal, which took to the sea and lost its legs. -A land mammal that was in the process of becoming a whale would fall b/t two stools
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This note was uploaded on 04/22/2010 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter 22 - Chapter 22-1/20/10 Descent with modification...

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