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Evidence for Evolution 2018-2019

Evidence for Evolution 2018-2019. Major Evidence for Evolution. Fossil record ✔ Morphology ✔ Homologous structures Analogous structures Vestigial structures Embryological development Biochemical evidence--DNA. 1. Fossil Record. What does the Fossil Record tell us about organisms?

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Evidence for Evolution 2018-2019

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  1. Evidence for Evolution2018-2019

  2. Major Evidence for Evolution • Fossil record ✔ • Morphology ✔ • Homologous structures • Analogous structures • Vestigial structures • Embryological development • Biochemical evidence--DNA

  3. 1. Fossil Record • What does the Fossil Record tell us about organisms? • Looks (size, shape, etc.) • Where or how they lived? • What other organisms they lived at that time? ✔

  4. ✔ • What time period they lived in (based on location in rock layers) • What order living things came in (based on location in rock layers) • Transitional forms • Organisms that were intermediate (between) two other major organisms

  5. Major Evidence for Evolution • Fossil record ✔ • Morphology ✔ • Homologous structures • Analogous structures • Vestigial structures • Embryological development • Biochemical evidence--DNA

  6. 2. Morphology In the fossil lab, we will study the morphology of the genus, Adventurian. We look at how the structures evolved over millions of years.

  7. Answer: • The skulls all have similar ridge that protrudes from the top. • The overall shape is the same. • Each skull has a set of flattened teeth. • Each skull has a large diastema, or gap between the front and back teeth. Example: Horse Give at least two similarities between the skulls that might lead to the conclusion that these are all related species.

  8. Answer: The size of the skull is dramatically larger in the modern horse. Example: Horse What is the biggest change in skull anatomy that occurred from the dawn horse to the modern horse?

  9. What is the biggest change in leg anatomy that occurred from the dawn horse to the modern horse? • Answer: • The modern horse • has much longer legs (started about the size of a dog) • has developed hooves in place of hand/foot bones (changed from 4 toes, to 3 toes to 1 hoof)

  10. Located in New York, New York

  11. Major Evidence for Evolution • Fossil record ✔ • Morphology ✔ • Homologous structures • Analogous structures • Vestigial structures • Embryological development • Biochemical evidence--DNA

  12. 3. Homologous Structures Homologous Structures are bodily structures, in organisms that share a common ancestor, that are similar in structure, but different in function.

  13. Focus on Human Arm

  14. Homologous Structures

  15. Major Evidence for Evolution • Fossil record ✔ • Morphology ✔ • Homologous structures ✔ • Vestigial structures • Analogous structures • Embryological development • Biochemical evidence--DNA

  16. 4. Vestigial Structures Vestigial structures are structures that serve no function in the present organism, BUT were useful structures in earlier ancestors • human ear muscles • human tailbone • human appendix

  17. Features present in modern animals that are no longer in use. Vestigial structures give hints as to the evolution of organisms. Can include neurological pathways, structures and organs. whale pelvis tailbone appendix

  18. https://www.youtube.com/watch?v=9VyrbG7FZ2Q

  19. What evidence do we have that organisms change over time? https://www.youtube.com/watch?v=rFxu7NEoKC8 Vestigial Parts

  20. Vestigial Organs Login Instructions

  21. Major Evidence for Evolution • Fossil record ✔ • Morphology ✔ • Homologous structures ✔ • Vestigial structures✔ • Analogous structures • Embryological development • Biochemical evidence--DNA

  22. 5. Analogous Structures Analogous structures are bodily structures that are similar in function, but not in structure. NOT EVIDENCE OF COMMON ANCESTRY Example: The wings of a bee and wings of a bird didn’t evolve from a common ancestor even though they are both used for flight.

  23. https://youtu.be/2N3OPRodRvk

  24. Major Evidence for Evolution • Fossil record ✔ • Morphology ✔ • Homologous structures ✔ • Vestigial structures✔ • Analogous structures ✔ • Embryological development • Biochemical evidence--DNA

  25. 6. Embryological Development • Embryo- fertilized egg that will/is in the process of growing into a new individual • Closely related organisms go through similar developmental stages early in development • All vertebrates have gill pouches sometime during their early development Login Instructions

  26. Explorer Learning- Embryo Development • Go to www.explorelearning.com • Click on “Enroll in a Class” button in the upper • right hand corner of the web page. • Type in your class code ________________. • Click continue and follow the directions on the site • to complete the enrollment. • Make your username your last name and first initial. • For example, Elizabeth Megonigal = megonigale • Password- make it your birthday • (the same as CCPS (mmddyear))

  27. Major Evidence for Evolution • Fossil record ✔ • Morphology ✔ • Homologous structures ✔ • Vestigial structures✔ • Analogous structures ✔ • Embryological development ✔ • Biochemical evidence--DNA

  28. 7. DNA/Biochemical Evidence DNA contains the instructions needed for an organism to develop, survive and reproduce. To carry out these functions, DNA sequences must be converted into messages that can be used to produce proteins. Proteins are the complex molecules that do most of the work in our bodies.

  29. The DNA that is used to translate nucleotide sequences into proteins (amino acids) is essentially the same in all organisms. • Proteins in all organisms are composed of the same set of 20 amino acids arranged in various sequences. • Powerful argument in favor of the common descent of the most diverse organisms.

  30. DNA/Biochemical Evidence Cytochrome C • An ancient protein common to all aerobic (oxygen breathing) organisms and is found in the mitochondria. • It is used in studying evolutionary relationships because most animals have this protein. • Cytochrome C is made of 104 amino acids joined together to make an “amino acid sequence”. • Organisms closely related have very similar cytochrome c amino acid sequences. • The more distantly related the organisms are, the greater the difference in the cytochrome c sequence

  31. Major Evidence for Evolution • Fossil record ✔ ✔ • Morphology ✔ • Homologous structures ✔ • Vestigial structures✔ • Analogous structures ✔ • Embryological development ✔ • Biochemical evidence—DNA ✔

  32. Looking at all the evidence with the Whale Evolution Kit. What is the theory of evolution? -is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits.

  33. Scientists behind the Theory of Evolution • Charles Darwin • Alfred Wallace • Jean Lamarck (only partly correct)

  34. 1. Charles Darwin • 1859 – “Origin of Species”published • Argued from evidence that species inhabiting Earth today descended from ancestral species • Proposed a mechanism for evolution  Natural Selection • Many scientists helped pave the way for Darwin’s Theory • www.brainpop.com/science/famousscientists/charlesdarwin/

  35. Theory of Evolution By Natural Selection • In each generation of a species, individuals have slight differences. • Sometimes these variations make an individual more successful in its environment

  36. (more food, live longer, reproduce more, attract better mates). Then individual may then reproduce and pass this variation on to its offspring. • Then the individual may reproduce and pass this variation on to its offspring.

  37. Natural Selection • Variations in individuals are controlled by genes. • Individuals have no control over what variations they will have.

  38. Useful variations are NOT ALWAYS passed on. • Variations that are not useful may also be passed on.

  39. 2. Alfred Russel Wallace • co-discovered natural selection and prompted Darwin to finally rush his Origin of Species to press. • One of the modern world’s greatest scientific adventurer explorers • eight-year exploration of Southeast Asia and the Malay Archipelago he wrote The Malay Archipelago in 1869, • Geographical Distribution of Animals (1876) is one of the seminal works in the field. • the workhorse of Darwinian evolution, diverged from Darwin’s methodological naturalism (i.e., the notion that scientists must invoke only natural processes functioning via unbroken natural laws in nonteleological ways) to propose a theory of evolution defined by intelligence and design.

  40. 3. Jean Lamarck WRONG!

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