Evidence of Evolution

Evidence of Evolution - 10/1/09 Which of the following is...

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10/1/09 1 Lecture 3 Evidence of Evolution Reading Text Ch 22 Which of the following is evolution, in the scientific sense? a. A human develops cancer b. A severe winter storm kills many sparrows in San Diego. Immediately afterwards there is a change in the average size of the sparrow population, because more small birds died in the storm than large birds. c. A population of birds molts from summer to winter plumage d. All of the above e. None of the above Common usage Evolution = to change Scientific usage Evolution = genetic change over time Microevolution - change in the genetic composition of a population across generations Macroevolution – change in the composition of species over time Which of the following is evolution, in the scientific sense? a. A human develops cancer b. A severe winter storm kills many sparrows in San Diego. Immediately afterwards there is a change in the average size of the sparrow population, because more small birds died in the storm than large birds. c. A population of birds molts from summer to winter plumage d. All of the above e. None of the above Dogs in trash bin “Maybe one day I’ll wake up and think, ahhh, I have evolved. ..” Could this happen?
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10/1/09 2 OVERVIEW - EVIDENCE OF EVOLUTION I. Fossil record A. Extinction B. Law of succession C. Transitional forms II. Vestigial organs III. Homology A. structural B. developmental C. molecular IV. Direct observation of changes A. Extinction fossil - any trace of an organism that lived in the past Extinction controversy ended Irish elk - largest antlers of any animal 1812 - Cuvier - Irish Elk different from any extant animal How did it go extinct? Irish elk lived 12,000- 11,000 years ago warm period between two ice ages OVERVIEW - EVIDENCE OF EVOLUTION I. Fossil record A. Extinction – change in composition of species B. Law of succession C. Transitional forms II. Vestigial organs III. Homology A. structural B. developmental C. molecular IV. Direct observation of changes Law of succession: fossils in one region similar to extant organisms in that same region Example: Australian fossils more similar to Australian organisms than they are to European organisms extinct marsupial (Australia) extant wombat (Australia)
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10/1/09 3 Darwin noted similar patterns extinct fossil glyptodont extant pygmy armadillo South America Southern North America OVERVIEW - EVIDENCE OF EVOLUTION I. Fossil record A. Extinction B. Law of succession C. Transitional forms II. Vestigial organs III. Homology A. structural B. developmental C. molecular IV. Direct observation of changes Transitional forms - organisms that have characteristics of both ancestral and modern forms Useful – show how modern form could have evolved “Creature Comforts” Cat and dog on couch
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Evidence of Evolution - 10/1/09 Which of the following is...

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