Presentation on theme: "Chapter 15 Evolution Section 1: Darwin’s Theory of Natural Selection"— Presentation transcript:
1Chapter 15 Evolution Section 1: Darwin’s Theory of Natural Selection Section 2: Evidence of EvolutionSection 3: Shaping Evolutionary Theory
2Darwin on the HMS Beagle Chapter 15Evolution15.1 Darwin’s Theory of Natural SelectionDarwin on the HMS BeagleDarwin’s role on the ship was as naturalist and companion to the captain.His job was to collect biological and geological specimens during the ship’s travel.
3Chapter 15Evolution15.1 Darwin’s Theory of Natural SelectionThe Galápagos IslandsDarwin began to collect mockingbirds, finches, and other animals on the four islands.He noticed that the different islands seemed to have their own, slightly different varieties of animals.
4Populations from the mainland changed after reaching the Galápagos. Chapter 15Evolution15.1 Darwin’s Theory of Natural SelectionAlmost every specimen that Darwin had collected on the islands was new to European scientists.Populations from the mainland changed after reaching the Galápagos.
5Darwin Continued His Studies Chapter 15Evolution15.1 Darwin’s Theory of Natural SelectionDarwin Continued His StudiesDarwin hypothesized that new species could appear gradually through small changes in ancestral species.Darwin inferred that if humans could change species by artificial selection, then perhaps the same process could work in nature.
6Individuals in a population show variations. Chapter 15Evolution15.1 Darwin’s Theory of Natural SelectionNatural SelectionIndividuals in a population show variations.Variations can be inherited.Organisms have more offspring than can survive on available resources.Variations that increase reproductive success will have a greater chance of being passed on.
8Darwin’s theory of natural selection is not synonymous with evolution. Chapter 15Evolution15.1 Darwin’s Theory of Natural SelectionThe Origin of SpeciesDarwin published On the Origin of Species by Means of Natural Selection in 1859.Darwin’s theory of natural selection is not synonymous with evolution.It is a means of explaining how evolution works.
915.2 Evidence of Evolution Support for Evolution The fossil record Chapter 15Evolution15.2 Evidence of EvolutionSupport for EvolutionThe fossil recordFossils provide a record of species that lived long ago.Fossils show that ancient species share similarities with species that now live on Earth.GlyptodontArmadillo
10Chapter 15Evolution15.2 Evidence of EvolutionDerived traits are newly evolved features, such as feathers, that do not appear in the fossils of common ancestors.Ancestral traits are more primitive features, such as teeth and tails, that do appear in ancestral forms.Anatomically similar structures inherited from a common ancestor are called homologous structures.
11predicts that features of ancestors that no Chapter 15Evolution15.2 Evidence of EvolutionVestigial StructuresStructures that are the reduced forms of functional structures in other organisms.Evolutionary theorypredicts that features of ancestors that nolonger have a function for that species willbecome smaller over time until they are lost.
12Chapter 15Evolution15.2 Evidence of EvolutionAnalogous structures can be used for the same purpose and can be superficially similar in construction, but are notinherited from acommon ancestor.Show that functionally similar features can evolve independently in similar environments
13Comparative Biochemistry Chapter 15Evolution15.2 Evidence of EvolutionComparative BiochemistryCommon ancestry can be seen in the complex metabolic molecules that many different organisms share.
14Chapter 15Evolution15.2 Evidence of EvolutionComparisons of the similarities in these molecules across species reflect evolutionary patterns seen in comparative anatomy and in the fossil record.Organisms with closely related morphological features have more closely related molecular features.
15Geographic Distribution Chapter 15Evolution15.2 Evidence of EvolutionGeographic DistributionThe distribution of plants and animals that Darwin saw first suggested evolution to Darwin.RabbitMara
16Evolution is intimately linked with climate and geological forces. Chapter 15Evolution15.2 Evidence of EvolutionPatterns of migration were critical to Darwin when he was developing his theory.Evolution is intimately linked with climate and geological forces.
17Chapter 15Evolution15.2 Evidence of EvolutionTypes of AdaptationAn adaptation is a trait shaped by natural selection that increases an organism’s reproductive success.Fitness is a measure of the relative contribution an individual trait makes to the next generation.
18Allows organisms to become almost invisible to predators Chapter 15Evolution15.2 Evidence of EvolutionCamouflageAllows organisms to become almost invisible to predatorsLeafy sea dragon
19One species evolves to resemble another species. Chapter 15Evolution15.2 Evidence of EvolutionMimicryOne species evolves to resemble another species.Western coral snakeCalifornia kingsnake
20Consequences of Adaptations Chapter 15Evolution15.2 Evidence of EvolutionConsequences of AdaptationsSome features of an organism might be consequences of other evolved characteristics.They do not increase reproductive success.Features likely arose as an unavoidable consequence of prior evolutionary change.
2115.3 Shaping Evolutionary Theory Chapter 15Evolution15.3 Shaping Evolutionary TheoryMechanisms of EvolutionPopulation geneticsHardy-Weinberg principle states that when allelic frequencies remain constant, a population is in genetic equilibrium.
22Chapter 15Evolution15.3 Shaping Evolutionary TheoryGenetic DriftA change in the allelic frequencies in a population that is due to chanceIn smaller populations, the effects of genetic drift become more pronounced, and the chance of losing an allele becomes greater.
23Chapter 15Evolution15.3 Shaping Evolutionary TheoryFounder EffectOccurs when a small sample of a population settles in a location separated from the rest of the populationAlleles that were uncommon in the original population might be common in the new population.
24Chapter 15Evolution15.3 Shaping Evolutionary TheoryBottleneckOccurs when a population declines to a very low number and then rebounds
25Chapter 15Evolution15.3 Shaping Evolutionary TheoryGene FlowIncreases genetic variation within a population and reduces differences between populationsNonrandom MatingPromotes inbreeding and could lead to a change in allelic proportions favoring individuals that are homozygous for particular traits
26Chapter 15Evolution15.3 Shaping Evolutionary TheoryNatural SelectionActs to select the individuals that are best adapted for survival and reproduction
27Chapter 15Evolution15.3 Shaping Evolutionary TheoryStabilizing selection operates to eliminate extreme expressions of a trait when the average expression leads to higher fitness.
28Chapter 15Evolution15.3 Shaping Evolutionary TheoryDisruptive selection is a process that splits a population into two groups.
29Chapter 15Evolution15.3 Shaping Evolutionary TheorySexual selection operates in populations where males and females differ significantly in appearance.Qualities of sexual attractiveness appear to be the opposite of qualities that might enhance survival.
30Chapter 15Evolution15.3 Shaping Evolutionary TheoryCoevolutionThe relationship between two species might be so close that the evolution of one species affects the evolution of the other species.Mutualism
31Chapter 15Evolution15.3 Shaping Evolutionary TheoryConvergent EvolutionUnrelated species evolve similar traits even though they live in different parts of the world.
32Chapter 15Evolution15.3 Shaping Evolutionary TheoryRate of SpeciationEvolution proceeds in small, gradual steps according to a theory called gradualism.Punctuated equilibrium explains rapid spurts of genetic change causing species to diverge quickly.
3315.3 Shaping Evolutionary Theory Chapter 15Evolution15.3 Shaping Evolutionary Theory
35Chapter Resource Menu Chapter Diagnostic Questions EvolutionChapter Resource MenuChapter Diagnostic QuestionsFormative Test QuestionsChapter Assessment QuestionsStandardized Test Practicebiologygmh.comGlencoe Biology TransparenciesImage BankVocabularyAnimationClick on a hyperlink to view the corresponding feature.
36Which is not a principle of Darwin’s theory about Chapter 15EvolutionChapter Diagnostic QuestionsWhich is not a principle of Darwin’s theory aboutthe origin of species?Individuals show variations.Variations can be inherited.Organisms have more offspring than available resources will support.Offspring always inherit the best traits.ABCDCDQ 1
37Identify the term that is used to describe Chapter 15EvolutionChapter Diagnostic QuestionsIdentify the term that is used to describeanatomically similar structures inherited froma common ancestor.ancestral traitsanalogous structureshomologous structuresvestigial structuresABCDCDQ 2
38Which is not a vestigial structure? Chapter 15EvolutionChapter Diagnostic QuestionsWhich is not a vestigial structure?snake pelvisKiwi wingsporpoise flipperhuman appendixABCDCDQ 3
39Which was Charles Darwin’s only qualification Chapter 15Evolution15.1 Formative QuestionsWhich was Charles Darwin’s only qualificationfor his position as naturalist on the Beagle?a degree in theologyan interest in sciencea knowledge of biologyan understanding of geologyABCDFQ 1
40What was Darwin’s term for selective breeding? Chapter 15Evolution15.1 Formative QuestionsWhat was Darwin’s term for selective breeding?evolutionspeciationartificial selectionnatural selectionABCDFQ 2
41What did Darwin infer from his observations of artificial selection? Chapter 15Evolution15.1 Formative QuestionsWhat did Darwin infer from his observations ofartificial selection?Animal breeders could create new species.A similar process could work in nature.Reproductive success could be increased.Variation in a species could be produced.ABCDFQ 3
42What is the relationship between the terms Chapter 15Evolution15.1 Formative QuestionsWhat is the relationship between the termsnatural selection and evolution?They mean the same thing.Evolution works against natural selection.Evolution explains how natural selection works.Natural selection explains how evolution works.ABCDFQ 4
43Which is an example of a derived trait? Chapter 15Evolution15.2 Formative QuestionsWhich is an example of a derived trait?a tailbonesfeathersteethABCDFQ 6
44Which features are similar in use and evolve in Chapter 15Evolution15.2 Formative QuestionsWhich features are similar in use and evolve insimilar environments, but do not evolve from acommon ancestor?analogous structuresembryological structureshomologous structuresvestigial structuresABCDFQ 7
45Organisms with similar anatomy share similar DNA sequences. Chapter 15Evolution15.2 Formative QuestionsOrganisms with similar anatomy share similar DNA sequences.TrueFalseABFQ 8
46At the heart of the theory of evolution by natural Chapter 15Evolution15.2 Formative QuestionsAt the heart of the theory of evolution by naturalselection lies the concept of __________.adaptationbiogeographygradualismspeciationABCDFQ 9
47The development of the evolutionary theory has Chapter 15Evolution15.3 Formative QuestionsThe development of the evolutionary theory hasled to the understanding that the raw materialfor evolution is _________.genestraitsadaptationcompetitionABCDFQ 10
48Chapter 15Evolution15.3 Formative QuestionsWhy does the ratio of gray to red owls remain the same after the population has doubled?They each have different predators.They compete with one another for resources.Both are equally adapted to survive in their environment.New individuals have emigrated into the population.ABCDFQ 11
49Which of these conditions can act on Chapter 15Evolution15.3 Formative QuestionsWhich of these conditions can act onphenotypes to provide adaptive advantagesto a population?mutationsnatural selectionnonrandom matingsmall population sizeABCDFQ 12
50Determine which morphological adaptation the Chapter 15EvolutionChapter Assessment QuestionsDetermine which morphological adaptation themonarch butterfly exhibits.camouflagemimicryembryological adaptationvestigial structureABCDCAQ 1
51What tempo of evolution does this model represent? Chapter 15EvolutionChapter Assessment QuestionsWhat tempo of evolution does this model represent?gradualelevatedsequentialpunctuatedABCDCAQ 3
52Standardized Test Practice Chapter 15EvolutionStandardized Test PracticeWhich is the best explanation for the similarities in the construction of these forelimbs?Each forelimb is a similar modification derived from a different ancestor.Natural selection has produced similar modifications in the forelimb.They are functionally similar features that have evolved independently.They are modifications of the forelimbs of a common ancestor.ABCDSTP 2
53Standardized Test Practice Chapter 15EvolutionStandardized Test PracticePredators learn to avoid monarch butterflies because they contain a poison that is distasteful and can cause the predator to get sick. The viceroy butterfly finds protection by closely resembling the monarch. What is this adaptation in the viceroy called?camouflagefitnessmimicryresemblanceABCDSTP 3
54Standardized Test Practice Chapter 15EvolutionStandardized Test PracticeWithin a population of squirrels, those that live higher in the mountains where it is cooler have long fur. Squirrels that live in the foothills where it is warmer have short fur. The original population is believed to have had intermediate fur length. Which graph represents this type of natural selection?ABCSTP 5