POPULATION change over time Natural Selection Definition The process whereby organisms better adapted to their environment tend to survive and produce more offspring Adaptation A change or process of change by which an organism or species becomes ID: 1047208
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1. EvolutionDefinition: The process when the overall POPULATION change over time.
2. Natural SelectionDefinition: The process whereby organisms better adapted to their environment tend to survive and produce more offspring.
3. AdaptationA change or process of change by which an organism or species becomes better suited to its environment.
4. Evolution act at the level of POPULATION
5. Natural selection at the level of INDIVIDUAL
6. MimicryDefinition: The phenomenon whereby unprotected prey species gain protection from predators by mimicking toxic or other wise protect species.
7. EvolutionPeople & Theories
8. Charles Darwin1809-1882The Father of EvolutionBorn in 1809, EnglandSailed on the HMS BeagleDuring his voyage, he made observations that led him to his THEORY OF EVOLUTINON.
9. Darwin’s THEORY OF EVOLUTION:a scientific explanation for the diversity of life, by proposing how modern organism evolved from common ancestors.
10. This voyage lasted from 1831 to 1836.
11. The Galapagos Islands lie 500 miles west of Ecuador in the Pacific Ocean, directly on the equator.Many of Darwin’s conclusions were based on observations of wildlife in the Galapagos Islands.“Galapagos” means turtle.
12. Darwin called this…evolutionwhich means change in species over timeAfter returning from the Galapagos and studying different types of plants & animals he collected during the voyage, Darwin concluded that organisms change over time….
13. Jean LamarckFrench scientist, who in 1809 proposed a hypothesis for how organisms change over generations.believed that over the lifetime of an organism, physical features would increase or decrease in size because of either the use or disuse of the feature. changes would then be passed on to offspring, enabling species to change over time.
14. Lamarck had correctly identified that a change is a species is linked to an organism’s environmental condition.
15. Thomas MalthusWrote an essay in 1798 that said if the human population grew unchecked, there wouldn’t be enough living space and food for everyone.Malthus said that the forces that controlled population growth included war, disease natural disasters and famine
16. Alfred WegenerMost well known for his Continental Drift hypothesis (1912), which led to the modern science of plate tectonics.
17. In 1910, upon examining a new map that included African and South American coastline research data, Alfred noticed that depth features for corresponding coastline contours of the two continents matched, but did not have time to think about it much until later, in 1911, when he read paleontological evidence of creatures existing on the two continents that could not possibly have crossed the vast ocean distances. https://www.youtube.com/watch?v=TzzGPfVx32M
18. MacroevolutionRefers to major evolutionary changes over time, the origin of new types of organisms from previously existing, but different, ancestral types. Examples of this would be fish descending from an invertebrate animal, or whales descending from a land mammal.
19. MicroevolutionRefers to varieties within a given type.Change happens within a group, but the descendant is clearly of the same type as the ancestor. This might better be called variation, or adaptation, but the changes are "horizontal" in effect, not "vertical." Changes might be accomplished by "natural selection," in which a trait within the present variety is selected as the best for a given set of conditions, or accomplished by "artificial selection," such as when dog breeders produce a new breed of dog.
20. Pinky- 1. Population SizeSmall population allows chance to take over.
21. Ring Finger: 2. Non- Random MatingOrganisms choose mate based on physical features and location.
22. Middle Finger- 3. Mutation Mutation, change in a DNA/gene, can affect frequency of gene pool.
23. Pointer Finger- 4. Movement/MigrationGene flow: Movement of individual into an areal will change the gene frequencyImmigration: individuals moving into an areaEmigrate: individual moving out of an area
24. Thumb- 5. AdaptationNatural selection Favors individuals with traits that are suitable for the environment (thumbs up)Selects against individuals with traits that are unfit for the environment. (thumbs down)
25. Main Types of Selection PressuresStabilizing SelectionNatural selection favors the average for population selectedDirectional SelectionNatural selection favors one extreme of the population for that traitoften happens when environment changes in a consistent way- e.g.climate gets colder.Disruptive SelectionNatural selection favors both extremes selectedCauses species to diverge
26. Artificial SelectionThe intentional breeding for certain traits, orcombinations of traits, over others… this canlead to speciation. (Human induced)What types of traits are selected for?
27. Speciation:The formation of new and distinct species in the course of evolutionWhat is speciation?
28. Allopatric SpeciationDefinition: new species evolves as a result of geographic isolationTypes of Speciation
29. Sympatric SpeciationDefinition: new species evolves from single ancestor while living in same geographic niche (organism’s “place” in ecosystem)Types of Speciation
30. Parapatric SpeciationDefinition: new species evolves as a result of partial geographic isolation as a result of occupying a new/different nicheTypes of Speciation
31. Divergent EvolutionDefinition: new species evolves from a common ancestorTypes of Evolution
32. Convergent EvolutionDefinition: unrelated species become similar as they adapt to similar environmentsTypes of Evolution
33. Parallel EvolutionDefinition: development of a similar trait in related, but distinct, species descending from a common ancestor Types of Evolution
34. CoevolutionDefinition: influence of closely associated species on each other in their evolutionTypes of Evolution
35. Definition: structures present in different organisms that have the same function but are structurally different and have different originsAnalogous structures
36. Definition: structures present in different organisms that have the same underlying structure but may have different functionsHomologous structures
37. Prezygotic IsolationTypes of isolationDefinition: reproductive isolation preventing a zygote Example: geographic, behavioral, mechanical
38. Geographic IsolationWhen a population is divided into two or more smaller populations due to PHYSICAL BARRIERS. This can occur when rivers change course, mountains rise, continents drift, or organisms migrate.Example: Northern Spotted Owl and Mexican Spotted Owl
39. Behavioral IsolationTwo species do not mate because of differences in courtship behavior.Example: Blue footed boobies (mating dance), birds (mating song), nocturnal versus diurnal
40. Postzygotic IsolationTypes of isolationHorseDonkeyHybrid = MuleCan NOT reproduceDefinition: reproductive isolation that occurs after two species have matedExample: hybrid mule offspring are infertile
41. Embryology Station- a science which is about the development of an embryo from the fertilization of the ovum to the fetus stageSort the cards into their correct location in the chart then answer questions.
42. Embryology
43. Comparative Anatomy (Homologous structure) study of the body structures of different species of animals in order to understand the adaptive changes they have undergone Read and compare the anatomical structures of different species and answer the questions.
44. Molecular Biology- study of biology at a molecular levelCompare the Hox gene sequences between different species and answer the questions.
45. Cladogram- a chart that shows an organism's evolutionary historyStudy the cladogram and answer the related questions.
46. Biogeography- study of geographical distribution of organisms
47. What is evolution?Definition: Change in the allele frequency of a population over time.
48. Allele FrequenciesThe amount of an allele in a population“B”“b”
49. How does a population change over time?Genetic Drift-When the allele frequencies of a population is changed due to randomness or chance. –Reduce genetic variation
50. How does a population change over time?Gene FlowWhen alleles travel from one population to another population of the same species. - Migration
51. Genetic Drift vs. Gene Flowhttps://www.youtube.com/watch?v=Q6JEA2olNts
52. Beetles Modeling LabObjective: Observe how gene flow and genetic drift can affect the allele frequencies of a population.
53. Bottle NeckWhen a population’s size is reduced for at least one generation due to catastrophic event.Example: Northern elephant seal
54. Founder EffectOccurs when a new colony is started by a few members of the original population.Example: Polydactyl in Amish communities
55. Cladograms
56. Cladograms are used to…Organize organisms based on evolutionary relationships (phylogeny).In other words… who is related to who and where did we come from…
57. How are cladograms constructed?Organisms are grouped together based on their shared derived characteristics (trait modified from the ancestral trait).
58. What do you know?Using the cladogram, which animals have claws/nails? (Hint: 4) Which animals have fur/mammary glands? (Hint 2)To what is the chimp most closely related to?
59. Look at the cladogram at the right. What conclusions can be drawn about the relationship between humans and chimps?Image courtesy of http://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_05
60. How to read a CladogramThis diagram shows a relationship between 4 relatives. These relatives share a common ancestor at the root of the tree.Note that this diagram is also a timeline. The older organism is at the bottom of the tree.The four descendents at the top of the tree are DIFFERENT species. This is called SPECIATION.Image courtesy of http://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_05
61. Branches on the tree represent SPECIATION, the formation of a new species.The event that causes the speciation is shown as the fork of the “V”.Image courtesy of http://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_05
62. Species B and C each have characteristics that are unique only to them.But they also share some part of their history with species A. This shared history is the common ancestor.Image courtesy of http://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_05
63. A CLADE is a group of organisms that come from a common ancestor.If you cut a branch of the tree, you could remove all the organisms that make up a CLADE.Image courtesy of http://evolution.berkeley.edu/evolibrary/article/0_0_0/evo_06