1. DESCENT WITH MODIFICATION A Darwinian View of Life AP BIOLOGY Chapter 22 Image from: Biology by Miller and Levine; Prentice Hall Publishing©2006

2. WHO INFLUENCED DARWIN’S THINKING Image from: AP BIOLOGY by Campbell and Reece Figure 22.2 Linnaeus (classification) Hutton (gradual geologic change) Lamarck (species can change) Malthus (population limits) Cuvier (fossils, extinction) Lyell (modern geology) Darwin (evolution, nutural selection) Mendel (inheritance) Wallace (evolution, natural selection) 1750 American RevolutionFrench Revolution U.S. Civil War 1800 1850 1900 1795Hutton proposes his theory of gradualism. 1798 Malthus publishes “Essay on the Principle of Population.” 1809 Lamarck publishes his theory of evolution. 1830 Lyell publishes Principles of Geology. 1831–1836 Darwin travels around the world on HMS Beagle. Darwin begins his notebooks on the origin of species. 1837 Darwin writes his essay on the origin of species. 1844 Wallace sends his theory to Darwin. 1858 The Origin of Species is published. 1859 Mendel publishes inheritance papers. 1865

3. Aristotle- (384-322 B.C.) Species are fixed (unchanging) BUT recognized similarities Image from: http://www.ucmp.berkeley.edu/history/aristotle.html Arranged life forms on a scale of increasing complexity scala natura- “scale of nature” http://www.kheper.net/topics/greatchainofbeing/index.html

4. Founder of TAXONOMY-1735 Science of grouping & naming Sought to discover order in the diversity of life “for the greater glory of God” Each creature was special- NO evolutionary link Devised classification system based on morphology (form and structure) (1707-1778) Image from: http://www.medusozoa.com/images/linnaeus.jpg Binomial Nomenclature: Naming system that gives organisms a two part scientific name- Genus species Still used today

5. LINNAEUS’S SYSTEM Nested hierarchy Taxon = classification unit to which organisms are assigned http://content.answers.com/main/content/wp/en-commons/thumb/d/d6/150px-Biological_classification_L_Pengo.svg.png Ex: Panthera is a taxon at the genus level Mammalia is a taxon at the class level

6. Kidspiration by Riedell Image Sources: see end of show

7. Kingdom Phylum Class Order Family Genus Species Animalia Chordata Mammalia Carnivora Felidae Panthera leo http://www.vetmed.wisc.edu/dms/fapm/personnel/tom_b/2004-lion.jpg Kids Prefer Cheese Over Fried Green Spinach Kings Play Chess On Fat Green Stools King Phillip Cried Oh For Goodness Sake!

8. GENUS = group of closely related species GENUS = Ursus (Includes many kinds of bears) SPECIES = unique to each kind of bear http://www.macecanada.com/images/bears/kodiak_bear.gif http://students.cs.byu.edu/~tole/Virtual%20Zoo/polar-bear.jpg http://en.wikipedia.org/wiki/Image:Black_bear_large.jpg Ursus arctos Ursus maritimus Ursus americanis

9. Genus and species assignments provide 2 part scientific name Homo sapiens Image from: http://www.earlylearning.ubc.ca/images/photo_baby.jpg

10. Modern Taxonomy has added more Kingdoms AND more levels (DOMAINS) Linneaus only used 2 kingdoms (Plants & Animals) Domains are larger than Kingdoms and are based on the differences in ribosomal RNA

11. Ideas that shaped Darwin’s thinking: George Cuvier – Father of Paleontology http://upload.wikimedia.org/wikipedia/commons/2/28/Georges_Cuvier.jpg Fossils are remains of extinct life forms “CATASTROPHISM” - boundaries represent floods, droughts, etc. that destroyed many species living at that time ANTI-EVOLUTONIST

12. Ideas that shaped Darwin’s thinking: 1795 –James Hutton “GRADUALISM” Profound changes can result from cumulative effect of slow but continuous processes Proposed that the Earth was shaped by geological forces occurring over very long periods of time, and is MILLIONS not THOUSANDS of years old. http://www.creationism.org/books/TaylorInMindsMen/TaylorIMMc03.htm

13. Ideas that shaped Darwin’s thinking: 1833-Charles Lyell Incorporated Hutton’s ideas into “UNIFORMITARIANISM” Geological processes that shaped Earth are still operating at same rate. Darwin read his book on the Beagle voyage http://www.biologydaily.com/biology/Sir_Charles_Lyell

14. MODERN GEOLOGY http://wrgis.wr.usgs.gov/docs/usgsnps/animate/A08.gif

15. Ideas that shaped Darwin’s thinking: Thomas Malthus (1798) wrote essay on population growth Human suffering (disease, famine, homelessness, and war) are consequences to human population increasing faster than food and other resources http://www.nndb.com/people/250/000024178/malthus.jpg

16. Ideas that shaped Darwin’s thinking: Jean Baptiste Lamarck (1744-1829) One of first scientists to recognize that living things changed over time and that all species were descended from other species. 1809- Published his ideas about “Inheritance of Acquired Characteristics” the year Darwin was born http://www.educa.rcanaria.es/fundoro/00.corsi.htm

17. The male fiddler crab uses its front claw to attract mates and ward off predators. “USE or DISUSE” = Use it or lose it Through repeated use, the front claw becomes larger. The fiddler passes on this acquired characteristic to its offspring INHERITANCE OF ACQUIRED CHARACTERISTICS

18. What’s wrong with Lamarck’s hypothesis? Lamarck didn’t know about genes and how traits are inherited. Acquired traits are not passed on to offspring Or are they?... New field of EPIGENETICS is exploring this http://www.geocities.com/arnold_schwarzenegger_pictures/

19. What’s right with Lamarck’s hypothesis? Lamarck was first to develop a scientific hypothesis about evolution and recognize that organisms are adapted to their environment http://pegasus.cc.ucf.edu/~he599900/giraffeeating.jpg

20. Slide by Kim Foglia@ http://www.explorebiology.com/

21. In 1831, 22-year old Charles Darwin left England as naturalist aboard the HMS Beagle for 5 year voyage around the world. Mission: Chart the South American coastline Darwin noticed plants and animals were different from those he knew in Europe Wrote thousands of pages of observations and collected vast number of specimens Who Was Charles Darwin? http://www.solarnavigator.net/history/explorers_history/HMS_Beagle.jpg

22. Who Was Charles Darwin? Darwin spent a month observing life on the Galapagos Islands Each island has different rainfall and vegetation and its own unique assortment of plant and animal species. Biology by Miller and Levine; Prentice Hall Publishing©2006 http://mikebaird.com/ecuador/images/galapagos_off_ecuador_ng_map.jpg

23. Who Was Charles Darwin? Although animals on Galapagos resemble species on the South American mainland, many species were found no where else in the world = ENDEMIC http://www.darwinadventure.com/pictures/galapagos_giantortoise.jpg http://www.destination360.com/south-america/ecuador/galapagos-animals.php http://www.photoseek.com/galapago.html

24. DARWIN’S FINCHES Darwin collected 14 species of finches and hypothesized that the Galapagos had be colonized by organisms from the mainland that had then diversified on the various

25. After Darwin returned to England in 1836, he spent years examining specimens he brought back from voyage and filling notebooks with his ideas. He did not rush to publish his ideas because they disagreed with the fundamental scientific views of his day. In 1844 he wrote an essay describing his ideas and asked his wife to publish it if he died. http://www.elsie.brandeis.edu/images/journals.gif Who Was Charles Darwin?

26. In 1858 Alfred Russel Wallace, another Naturalist working in the West Indies, wrote an essay describing his work that summarized the same ideas Darwin had been thinking about for 25 years! http://www.thesecondevolution.com/wallace&darwin.jpg

27. Suddenly Darwin had incentive to publish the results of his work! In 1859 On the Origin of Species by Means of Natural Selection presented evidence and proposed a mechanism for evolution that he called NATURAL SELECTION http://www.loc.gov/exhibits/world/images/s125.jpg

28. Darwin’s Theory of Evolution Darwin Presents his Case Image from: Biology by Miller and Levine; Prentice Hall Publishing©2006

29. Isn’t evolution “just a theory”? In every day usage “theory” often refers to a hunch or a speculation. When people say, “I have a theory about what happened,” they are often drawing a conclusion based on fragmentary or inconclusive evidence. The formal scientific definition of “theory” is quite different from the every day meaning. It refers to a comprehensive explanation of some aspect of nature that is supported by a vast body of evidence. http://evolution.berkeley.edu/evosite/evohome.htm

30. In Science a theory is a well supported, testable explanation of phenomena that have occurred in the natural world. Example: Cell theory Atomic theory Gravitational theory Isn’t evolution just a theory? http://www.avgoe.de/StarChild/DOCS/STARCH00/questions/apple_falling.gif http://sixthsense.osfc.ac.uk/chemistry/atomic_structure2/atom.gif

31. VOCAB ADAPTATION- Any inherited characteristic that increases an organism’s chance of survival http://www.3kitty.org/travelrama/Photos/123-21-4x6.jpg http://www.wildlife-traps.com/skunks.html http://www.atomtigerzoo.com/photos/images/20060421233733_duckfeet.jpg

32. OVERPRODUCTION of OFFSPRING Capacity to over-reproduce seems characteristic of all species. http://atthecreation.com/DEER/too.many.deer.jpg http://www.biospheres.com/photogallery2ag/images/ladybugs_jpg.jpg WHAT IS DARWIN’S THEORY?

33. STRUGGLE FOR EXISTANCE means that members of each species must compete for food, space, and other resources. http://www.wasatchcomputers.net/gallery/elk_fight.jpg

34. WHAT IS DARWIN’S THEORY? GENETIC VARIATION is found naturally in all populations http://www3.nationalgeographic.com/animals/images/primary/zebra-herd.jpgImage from www.biologyzone.com

35. WHAT IS DARWIN’S THEORY? Some organisms in a population are less likely to survive. http://www.cartoonstock.com/newscartoons/cartoonists/rrs/lowres/rrsn69l.jpg

36. VOCAB Ability of an individual to survive and reproduce in its specific environment = FITNESS http://www.cartoonstock.com/newscartoons/cartoonists/cga/lowres/cgan170l.jpg

37. WHAT IS DARWIN’S THEORY? SURVIVAL OF THE FITTEST = Organisms which are better adapted to their environment tend to produce more offspring than organisms without those traits. http://www.poster.net/bedard/bed202.jpg

38. Over time, NATURAL SELECTION results in changes in the inherited characteristics of a population. These changes increase a species’ fitness in its environment. WHAT IS DARWIN’S THEORY? How Does Evolution Really Work?

39. POPULATIONS evolve NOT INDIVIDUALS. NATURAL SELECTION only works on heritable traits. A trait that is favorable in one environment may be useless or detrimental in another. IMPORTANT TO REMEMBER !

40. DESCENT WITH MODIFICATION suggests that each species has descended with changes from other species over time. This idea suggests that all living species are related to each other and that all species, living and extinct, share a common ancestor. WHAT IS DARWIN’S THEORY?

41. What do oranges, broccoli and Butterball turkeys have to do with EVOLUTION? (Answers to come in this slide show!) http://groups.wfu.edu/ModelUN/images/Cover/Oranges.jpg http://www.fx.clemson.edu/~ablank/126436919.Broccoli.jpg http://www.butterball.com/en/images/plan_n_prep/preparing/carving1.jpg THINK ABOUT IT

42. EVIDENCE OF EVOLUTION: 1.________________ 2.________________ 3. _______________ 4. _______________ 5. _______________ 6. _______________ 7. _______________ Fossil record Geographic Distribution Anatomical homologies Embryology Molecular homologies Can see Natural selection happen Artificial selection

43. ARTIFICIAL SELECTION WORKS Nature provides the variation through mutation and sexual reproduction and humans select those traits that they find useful EX: We have selected for and bred cows to produce more milk, turkeys with more breast meat, etc. http://lazerbrody.typepad.com/photos/uncategorized/turkey.gif http://www.pp3moo.com/hm2cow.jpg

44. BIOLOGY by Campbell and Reece Prentice Hall Publishing©2005 WE’VE DONE IT WITH PLANTS

45. WE’VE DONE IT WITH ANIMALS http://www.windows.ucar.edu/earth/geology/images/dogs_sm.jpg If humans can select for beneficial traits, why can’t nature? If artificial selection can achieve so much change in relatively short time, why can’t major changes happen over thousands of generations?

46. Now you know what broccoli and Butterball turkeys have to do with evolution! (Answers about oranges to come in this slide show!) http://groups.wfu.edu/ModelUN/images/Cover/Oranges.jpg http://www.fx.clemson.edu/~ablank/126436919.Broccoli.jpg http://www.butterball.com/en/images/plan_n_prep/preparing/carving1.jpg THINK ABOUT IT

47. How Do We Know Evolution Happens? The Fossil Record provides evidence that organisms have changed over time. http://www.bbc.co.uk/schools/gcsebitesize/img/bifossils.gif

48. If evolution has happened, we should be able to find evidence of evolution in the fossil record AND WE HAVE ! http://en.wikipedia.org/wiki/Image:Tiktaalik_BW.jpg BBC Tiktaalik video http://evolution.berkeley.edu/evosite/lines/IAtransitional.shtml

49. Lots of TRANSITIONAL FOSSILS have been found Scientific American; Dec 2005; Vol 293; p100-107

50. TIK-TAALIK Intermediate between fish and early tetrapods Fins have basic wrist bones and simple fingers Earliest fish with a neck Discovered by Neil Shubin and Ted Daeschler in 2004 http://evolution.berkeley.edu/evolibrary/images/news/tiktaalik_reconstruction.jpg

51. GEOGRAPHIC DISTRIBUTION = BIOGEOGRAPHY If Darwin’s theory is correct you would expect to find closely related yet different species living in a geographic region as they spread into nearby habitats and evolve. That’s EXACTLY what we do see!

52. GALAPAGOS FINCHES The beaks of Galapagos finches have adapted to eating a variety of foods http://images.encarta.msn.com/xrefmedia/aencmed/targets/illus/ilt/T014608A.gif

53. GALAPAGOS TORTOISES http://www.newtonswindow.com/problem-solving.htm Image from: BIOLOGY by Miller and Levine; Prentice Hall Publisher©2006 Little vegetation Long necks Lots of vegetation Short necks Intermediate vegetation Intermediate necks Tortoises adapted to different habitats as they spread from the mainland to the different islands. = DIVERGENT EVOLUTION = ADAPTIVE RADIATION

54. If Darwin’s theory is correct you would also expect to find different species living in far apart geographic regions but similar habitats becoming more alike as they adapt to similar environments. That’s EXACTLY what we do see!

55. BOTH LIVE IN FOREST ECOSYSTEMS Adapted to similar environments, but evolved independently from different ancestors. SUGAR GLIDER in Australia is a marsupial more closely related to Kangaroos than North American FLYING SQUIRRELS because its ancestors were marsupials.

56. Whales and sharks have a similar body design even though they are very different organisms (one is a fish; the other, a mammal) because they have independently adapted to living in a similar environment. http://news.bbc.co.uk/2/shared/spl/hi/guides/456900/456973/html/nn1page1.stm http://www.flmnh.ufl.edu/fish/gallery/descript/TigerShark/scars.JPG = CONVERGENT EVOLUTION

57. HOMOLOGOUS STRUCTURES- Forelimbs of all mammals share same arrangement of bones that can be traced to same embryological origin BIOLOGY by Campbell and Reece Prentice Hall Publishing©2005

58. TurtleAlligatorBirdMammal Ancient lobe-finned fish Section 15-3 EVOLUTION explains why certain characteristics in related species have an underlying similarity.

59. amnion /am·ni·on/ (am´ne-on) bag of waters; the extraembryonic membrane of birds, reptiles, and mammals, which lines the chorion and contains the fetus and the amniotic fluid http://medical-dictionary.thefreedictionary.com/amnions http://media-2.web.britannica.com/eb-media/27/117227-050-E1C9ABEE.jpg

60. VESTIGIAL ORGANS Some homologous structures are vestigial and have no useful function even though they are still present. Examples: Hipbones and pelvis in whales and boa constrictors Cecum (appendix) in humans Skink legs http://www.txtwriter.com/backgrounders/Evolution/EVpage12.html

61. http://www.medicalgeo.com/images/appendix.gif Most mammals have a pouch between their small and large intestine that contains bacteria to digest plants called a cecum. In humans the cecum is shrunken and unused. It is our appendix

62. EMBRYOLOGY Development of vertebrate embryos follows same path Image from: http://calspace.ucsd.edu/virtualmuseum/litu/03_3.shtml

63. Same groups of undifferentiated cells develop in the same order to produce the same tissues and organs of all vertebrates, suggesting that they all evolved from a common ancestor. Image from: http://io.uwinnipeg.ca/~simmons/16cm05/1116/16anim3.htm

64. Why grow a tail and then lose it? http://www.suite101.com/files/topics/6234/files/tail_HumanTail.gif HUMAN EMBRYO has a tail at 4 weeks which disappears at 8 weeks Pharyngeal pouches become gills in fish, parts of throat/ears in humans

65. http://www.medicalgeo.com/images/appendix.gif Nonfunctional legs in skinks Why would an organism possess organs without function? Why would an organism grow a part and then discard it? If organisms evolved from ancestors in which that part functioned, the gene code to make the part would still be there even though it doesn’t work. If the organ is not vital to survival, then natural selection would not cause its elimination.

66. MOLECULAR HOMOLOGIES All life forms share same genetic machinery (DNA & RNA) Universal genetic code Important genes share highly conserved sequences

67. Similarities in protein sequences suggests similarities in DNA Image from: Modern Biology by Holt, Rinehart, and Winston

68. Image from: BIOLOGY AP EDITION by Campbell and Reece; Prentice Hall Publishing©2005 Similarities in DNA and protein sequences suggest relatedness MOLECULAR HOMOLOGIES

69. Similarities in karyotypes suggest an evolutionary relationship Human: http://www.nationmaster.com/wikimir/images/upload.wikimedia.org/wikipedia/en/thumb/1/18/300px-Human_karyogram.png Chimpanzee: Middle School Life Science, published by Kendall/Hunt. Human- 46 chromosomesChimpanzee- 48 chromosomes

70. Even differences show relatedness Human: http://www.nationmaster.com/wikimir/images/upload.wikimedia.org/wikipedia/en/thumb/1/18/300px-Human_karyogram.png Chimpanzee: Middle School Life Science, published by Kendall/Hunt. Human- 46 chromosomes Chimpanzee- 48 chromosomes Chimpanzees have 2 smaller chromosome pairs we don’t have Humans have 1 larger chromosome pair (#2) they don’t have.

71. Remember: Protective TELOMERE sequences found at ends of chromosomes http://joannenova.com.au/Speaking/Morslids.html

72. 2. TELOMERES IN MIDDLE Human chromosome is only human chromosome that has telomere sequences at the ends BUT ALSO IN THE MIDDLE... suggesting it was made by joining two other chromosomes together. http://www.evolutionpages.com/chromosome_2.htm → → →

73. _________________ Chromosome #2 has a second inactive centromere region... suggesting it was made by joining two other chromosomes together. Which chromosomes? http://www.evolutionpages.com/chromosome_2.htm → EXTRA CENTROMERE

74. ________________________ If you take the two smaller chromosomes they have that we don’t, and place them end to end, the banding pattern is identical to human chromosome #2 http://www.evolutionpages.com/chromosome_2.htm BANDING PATTERN MATCHES

75. Why don’t dogs and cats need to eat fresh fruit, but you do? http://www.naturescornermagazine.com/NaturesBlog/images/dog%20care%20in%20summer.jpg http://www.alpo.com/where.aspx

76. Fish, amphibians, reptiles, and most mammals can make their own vitamin C, but humans can’t make vitamin C. Without fresh fruit, humans end up with scurvy. http://www.med.uc.edu/departme/cellbiol/Image7.gif http://www.rachelleb.com/images/2005_02_22/scurvy.jpg

77. Human DNA contains the gene that codes for the enzyme to make vitamin C, but it is nonfunctional. Guess what other group of organisms lack the ability to make their own Vitamin C? http://groups.wfu.edu/ModelUN/images/Cover/Oranges.jpg PRIMATES… which includes chimpanzees, orangutans, gorillas, and other apes.

78. PSEUDOGENES are vestigial genes. EX: Humans have more than 99 different odor receptor genes, but more than 70% of them are nonfunctional. http://www.animationplayhouse.com/new/dogs2.html http://unraveling.typepad.com/photos/uncategorized/nose_1.jpg

79. Slide by Kim Foglia@ http://www.explorebiology.com/

80. BIOLOGY by Campbell and Reece We can see Natural selection happen

81. BIOLOGY by Campbell and Reece We can see Natural selection happen

82. EX: Changes in disease-causing microbes that produce new organisms and new diseases. _______ ___ __________________________ http://www.hipusa.com/eTools/webmd/A-Z_Encyclopedia/tuberculosis.jpg http://www.hhmi.org/askascientist/images/hiv.gif Can see Natural selection happen Bird flu Antibiotic-resistant tuberculosis HIV Why does evolution matter now?

83. Researchers have developed numerous drugs to combat HIV –But using these medications selects for viruses resistant to the drugs Graph from BIOLOGY by Campbell and Reece Patient No. 1 Patient No. 2 Patient No. 3 Percent of HIV resistant to 3TC Weeks

84. PEPPERED MOTH Data from Kim Foglia @ www.biologyzone.com

85. Slide from Kim Foglia@www.biologyzone.com

86. Slide by Kim Foglia@www.biologyzone.com

87. PBS EVOLUTION VIDEO CLIPS Isn’t Evolution Just a Theory? QuickTime Who was Charles Darwin? QuickTime How Do we Know Evolution Happens? QuickTime How Does Evolution Really Work? QuickTime |QuickTime Why Does Evolution Matter Now? QuickTime Why is Evolution Controversial Anyway? QuickTime

88. Image Sources http://www.kidskonnect.com/Lions/lion.gif http://www.seattleschools.org/schools/blaine/ http://www.geocities.com/TheTropics/2428/directory.html http://www.gifs.net http://people.eku.edu/ritchisong/homepage.htm

89. http://anthro.palomar.edu/animal/images/platypus.gif http://www.drtoy.com/news/ http://www.ca4h.org/4hresource/clipart/animals/pics/dog.gif http://www.madlantern.com/clipart/cindexw.htm http://www.chm.bris.ac.uk/motm/trimethylamine/fish.gif

90. http://www.gifs.net http://www.dallas-zoo.org/featured/featured.asp?page=wc http://www.animationlibrary.com http://www.dynamicearth.co.uk/education/images/tree_frog.jpg