BIOL 1202 Chapter : Chapter 22
Document Summary
Chapter 22: change over time of the genetic composition of a population, decent of modern organisms with modification from preexisting, evolutionary adaptation organisms, accumulation of inherited characteristics that enhance organisms" ability to survive in specific environments. Pre-darwinian theory of evolution: lamarck, use and disuse- bodies of living organisms are modified through the use or disuse of parts, inheritance of acquired characteristics- these modifications are inherited by offspring. 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. Catastrophism: cuvier, catastrophes caused extinct species and strata. Gradualism: hutton, slow natural forces caused geological formations, not catastrophes. Uniformitarianism: lyell, the mechanisms of change are constant over time. ***observations of geological formations+rates processes occur= earth is much older than a few thousand years old.
