Sapiens: The History of our Species...Sapiens: The History of our Species “Light will be thrown on...
Transcript of Sapiens: The History of our Species...Sapiens: The History of our Species “Light will be thrown on...
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Sapiens:TheHistoryofourSpecies“Lightwillbethrownontheoriginofmanandhishistory”
C.DarwinOriginofSpecies1868
Mark&SaritaLevinthalWALLAFall2018
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OUR HISTORY AND CLOSE RELATIVES
The First 3.7 billion years
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HumanEvoluGon• GenusHomo2millionyearsold
– Howmanydifferentkindsofhumans?– Didtheymatewitheachother?– Howdohumanscomparetootherprimates?
• UniquenessofHomosapiens.– Onlybipedalquadrupeds– Ourlargebrain
• Abilitytocommunicate,understand,andcreatetools• InvesGgateourhistoryandnature
– Ourculture,societyandreligion
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Mammals
• AncestralTraits– GeneEvoluGon– Mammals
• DerivedTraits-Primates– Intelligence– CommunicaGon– OrganizedSociety– MaGngSchemes
ProbelesodonCynodont Adelobasileus-mammalianform
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Primates
• DerivedTraits• PrimateTaxonomy
– Strepsirrhine– Haplorhini
• Platyrrhini• Catarrhini
– Hominids
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UsingDNAforPhylogeny
• MolecularPhylogeny
• MolecularBarCode6
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Paleontology• Geochronology
– StraGgraphy– RadioisotopeDaGng
• ExposuredaGng– BiostraGgraphy
• ThermoluminescencedaGng
• IncrementaldaGng– Dendrochronology– Icecores– Lichenometry– Varves
• PalemagneGcdaGng7
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Archeology/Anthropology
• StraGgraphicSurvey• Remotesensing• Fieldsurveys
– ExcavaGons– Analysis
• Ethnography– SocialorganizaGon– Kinships– Myths
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OUR ANCESTORS AND CLOSE RELATIVES [TRIBE HOMINS]
Extinct animals after the Chimp/Homo split
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HomoDerivedTraits
• Bipedalism• Increasedbrainsize• Decreasedsexualdimorphism• Anatomical/PhysiologicalChanges
– UlnaropposiGon– Smallergut– Genitaldevelopment– Lossofbodyhair– Chin– EvoluGonofsweatglands– Cannotbreathanddrinksimultaneously
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HomininTimeline
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Chimp-HomoLastCommonAncestor• Ageofofsplit-7-10mya
• Fossilevidence• Sahelanthropustchadensis
• Moleculardata• MolecularClocks
• Speciesinter-maGngmodel• Chromosomestudies• Incompletelineageassortment
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Orrorintugenensis
• Livedindryevergreenforest– 6.1-5.7myaKenya
• DentaGonpabern– Unique– Canine-ape-like,smallermicrodont
• Bipedalclimbedtrees• ClassificaGon
– Directhumanancestor
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Ardipithecusramidus
• Earliesthominidfossil– Ethiopia4.4mya
• Inhabitedwoodedarea– AteC3plants
• Anatomy(unlikeape)– smallcranium:300-350cc– Teeth-omnivore– H=4gWt.=110lb.– PrimiGvehand,foot,limbs– Pelvis:changestobiped
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GracileAustralopithecines
Species TemporalRangemya
Habitat Cranialcapacity
anamensis 4.2-3.9 Kenya ?
afarensis 3.9-2.9 SoAfrica 380-430cc
africanus 3.3-2.1 SoAfrica 485cc
garhi 2.5 450cc
• homoprecursors– ShortCanineteeth– ScullplacementandfootprintBipedal
• Tooluse– FirsthominidwithduplicatedSGRP2(2.4mya)
• SexuallyDimorphic
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RobustAustralopithecines(Paranthropus)
• EastAfrica2.7-1.3mya• Derivedtraits
– Face• highinneurocranium
– Shortsnout– SagibalCrest– Teeth
• Incisors/caninessmallMolarsbig
– Massivejaw,molars• Nuts,seeds,grasses
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Species:Homo
Temporal(Kya)
Habitat AdultHeight
AdultMass(lb.)
CranialCapacity(cm3)5
habilis 2,330-1,440 EastAfrica 4’3” 73-121 550-687
rudolfensis 1900 Kenya 700ergaster 1,800-1,300 .Africa 5’9’’ 750-850erectus 1,900-143 Africa,
Eurasia5’11’ 130 900-1200
antecessor 1,200-800 W.Europe 5’9” 200 1000heidelbergensis 600-300 Europe,
Africa5’11” 200 1100-1400
sapiens 300-Present
Worldwide 4’7”-6’3” 110-220 950-1800
neanderthalensis 240-40 Europe,W.Asia
5’7” 121-154 1200-1900
floresiens 190-50 Indonesia 3’3” 55 400Denisova 40 Siberianaledi 300 S.Africa 4’11” 99 450
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DawnofHomosapiens• OldestFossils
– 300,000N.Africa– Faceevolvedbeforebackofskull
• LivingancestralpopulaGon– Khoi-San
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MigraGonofsapiens
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Bab-el-Mandeb
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MigraGontotheAmericas• MigraGon22.7-18.4ka
– LastGlacialMaximum– 2000females
• IsolatedinEasternBeringia(15,000yrs.)– Increaseinfemales– Coastalentryroutesouth
• ExGncGonofancientlineagesbyEuropeancolonizaGon
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EuropeanEarlyModernHumans
• Paleolithic– Aurignacian– Gravema
• Glacialrefuges– Solutrean– Magdalenian
• Mesolithic
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Danube-RhineRiverMigraGonroute
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COMPARING THE SAPIEN/APE GENOME
What genes make us human
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In Memorial: Luigi Cavalli-Sforza 1922-2018
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MaGngBetweenHomoSpecies
• Non-Africanssapiens1-4%NeanderthalDNA– 40,000Romanian6-9%
• 4-6generaGonsago• 1-6%DenisovanDNA
– Melanesians,Aborigines,Polynesians
• Neanderthal-Denisovan– Hybridfemale– 90,000yearsago– Neanderthalmother
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PopulaGonGenomicsofsapiens:Present/Past
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Comparingourchromosomestochimps
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GeneGcDifferencesbetweenHumansandotherGreatApes
• Human-Chimpsequences– 35millionsubsGtuGons-3%indel,duplicaGons
• GeneAddiGons– SegmentalduplicaGons– HumanlineagespecificinserGons
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ChangesinGeneRegulaGon• HumanAcceleratedRegions
– RegulatoryGenes• EnhancerSequences• RegulatoryGenesdeleted• Linagespecificadultchangesingeneexpression– Tissuespecific– Modulespecific
• Linagespecificdevelopmentalchanges– Timing
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FOXP2:LanguageGene
• MutaGoncausesaspeechdisorder• FOXP2presentinmanyvertebrates• EcholocaGoninbats
– Differentsequencesfordifferentecholators• EcholocaGoninCetaceans
– AllcetaceansshareauniquethreeaminoacidsubsGtuGon
• Songlearningincanaries– AcGvewhenrelearningsong
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GeneslostintheHominidLine
• Genelossinhumanlineage(80)– 36–olfactoryreceptors– CASPASE16-reducedlethalityofbacterialinfecGon
• LossofKRTHAP1–Thenakedape• MYH16Myosingene
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srGAP2gene
• 1/23genesduplicatedinhumansonly– 3.4myasrGAP2B(Australopithecus)– 2.4myasrGAP2C
• 100%sapiens;shortenedversion– 1myaSRGAP2D
• Controlgene(RhoGTPaseacGvaGngprotein)• Involved-neuralmigraGonandmaturaGon
– srGAP2C(duplicate)slowsmaturaGon,increasesneuralspinedensity
– Length/abilitybrainneurons31
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THE ORIGINS OF CULTURAL TRAJECTORIES
Prehistory and ancient history
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AnthropoceneEpoch
• Epoch:sapienimpactongeology/ecosystems– FivepriormassexGncGons(600millionyears)– CurrentExGncGonrate(100fold)/extentincreased
– AgriculturalRevoluGon12-15,000yearsago• Biodiversity
– ExGncGonsinPaleolithicera• ClimateChange
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sapienIntelligence
• PercepGonofReality– Statesofconsciousness
BehavioralModernityWhendidithappen?
• Theoryofthemind– Selfawareness– Awarenessofmindsofothers
• EvoluGonoftheMind
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StoneTools
• Manufacture:lithicreducGonbyknapping• ModeI:OldowanIndustry• ModeII:AcheuleanIndustry• ModeIII:MousterianIndustry• ModeIV:AurignacianIndustry• ModeV:MicrolithicIndustry• NeolithicIndustry
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SpeechandSymbols
• AnatomicalExapGons– Tongue– Lips– Respiratorycontrol– Larynx
• NeurologicaladapGon– Broca’sArea– Wernicke'sarea
• LanguageevoluGontheories
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OriginsofReligion
• AnthropologicTheories– CausalConnecGons– Socialcohesion
• PaleolithicEvidence• OrganizedReligion
– FormaGonofStates– BicameralBrain
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OriginofVisualArt
• EarliestArt• ArtoftheMiddlePaleolithic
– NeanderthalArt• ArtoftheUpperPaleolithic
– RockandCavePainGng– Jewelry– Sclputure
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SocialEvoluGonofsapiensPeriod-yearsbeforePresent
SocietyType NumberofIndividuals
WorldPopulaGon
100,000-10,000 Bands 10s-100s 100,000
10,000-5,000 Tribes 100s-1000s 2million
5000-3000 Chiefdoms 1,000-10,000 18million
3000-1000 States 10,000-100,000 45million
2000-Present Empires 100,000-1,000,000 7.4billion
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NeolithicRevoluGon
• FounderGrains• DomesGcaGonofAnimals
• CulturalFicGons
FerGleCrescent40
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WhyEuropeans?
• TheScienGficRevoluGonTheory(Harari)• Europewasresourcepoor(Diamond)
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Linked slides
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AncestralTraits
Linkedslide4.1
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TECHNIQUES
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AnimalCell/MaternalInheritance
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MitochondrialEve
• Lived140-200kya• CommonFallacies
– Shewasnottheonlywoman– mt.evecanchange– Notacontemporaryof“Adam– NottheMRCAofallsapiens
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PrimatemtDNAtree
Linkedslide6.3
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YchromosomeAdam
• Y-MRCAforsapiens275,000– sapiens-Neanderthal588,000
• Uncoverpreviouslyunknowndivergentlineages:– Y-chromosomelineageswouldconvergeonanindividualwholivedfurtherbackinGme.
• ThediscoveryofaddiGonaldeeprooGngmutaGonsinknownlineagescouldleadtoarearrangementofthefamilytree.
• RevisionoftheY-chromosomemutaGonratecanchangetheesGmateoftheGmewhenhelived
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Whatareisotopes?• Allatomshaveauniqueatomicnumber
– Equalnumberofprotons(mass)andelectrons(chemicalproperGes)
– Containneutronsequaltoormorethanprotons• Isotopesareversionsofatomscontainingmorethan
normalneutrons– Someisotopesareunstable– DecayatacharacterisGcrate
• ExponenGal-asetproporCondecaysperunitGme– Half-life:Timespaninwhichhalftheisotopicatomshavedecayed
– Measuredbyphysio-chemicaltechniques
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STONE TOOLS Lithic Industry
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LithicReducGon
Hammerstone
scrappersLinkedslide35.1
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ModeItoolsOldowan
• Manufacture-Hammerstonestruckonedgeofcore
• Uses– Heavydutymostlycoreschoppers
– Lightduty-flakesscrappers,awls
• ToolUsers– A.garhi,H.habilis,H.erectus
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ModeII:Acheulean
• LowerPaleolithic• ToolTypes
– Stages– Manufacture– Uses
• DistribuGon• Users
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ModeIIIMousterian
• MiddlePaleolithic• Toolkit
– Types– Manufacture– Uses
• Users• LocaGons
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ModeIV:Aurignacian• UpperPaleolithic• Toolkit
– Types– Manufacture– Uses
• LocaGons• Users
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MicrolithicIndustry• Toolkit• UpperPaleolithic
– Types– Manufacture
• Uses• LocaGons• Users
Linkedslide35.6
TruncatedBlades
BackededgeBladeDufourpoints
GravemaMicropoint
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NeolithicIndustry
• NeolithicPeriods• LithicTechnology• OtherArGfacts
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DERIVED TRAITS HOMO
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Bipedalism
• Earliesthominids• AdapGvevalue• AnatomicalChanges
– Foot– Knee– Limbs– Hips– Vertebralcolumn– Skull
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BrainSize
• Post-natalbraingrowth• Changesinbrainstructure– Temporallobe– Pre-frontalcortex– neocortex– cerebellum
• Changesinskullmorphology
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SexualDimorphism
• Malechanges– ReducGonofmalecanineteeth– Reducedmalebrowridges
• Femalechanges– Hiddenestrus– YearroundferGlity– Menopause
• NeotonyLinkedslide10.3
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PRIMATES
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Strepsirrhine
Colugos
GalagosLoris
TreeShrew
LemurEu-Primatefossil
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• Ancestraltraits– Nocturnal– doublechambereduterus
• Derivedtraits– Eyesandvision– Auditory– Anatomy– Ecology
Tarsier
Tarsier
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NewWorldMonkeys
• Small-mid-size– 120g-15kg
• Flat-nose• Prehensiletail• Arboreal• Formmonogamouspairbonds– Parentalcare
• Intelligence
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Catarrhini
• DerivedTraits• EvoluGon• Groups
– Cercopithecidea(OldWorldMonkeys)– Hominoidea(Apes)
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OldWorldMonkeys
• Derivedtraits– Tail– Size– Teeth
• Naturalhistory– Habitat– Diet– ReproducGon
• Tooluse
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• Hylobates• Ponginea• Gorilla• Chimps
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Hylobates
• SexualDimorphic– pairbond
• Small,tailless• Swingbetweenbranches
• Diverged16.8mya– Generadiverge5-7mya– chromosomerearrangement
Gibbons Linkedslide5.4.2.1
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Pongo(orangutans)• Pongosplit8.5-12.5mya• OriginatedinAfrica
– human-apeclade– 16.9-19mya
• CurrentlyliveinBorneo– Arboreal,solitary
• Highlyintelligent– SophisGcatedtools– Elaboratesleepingnests– Possiblecultures
Linkedslide5.2.2.2
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Gorilla• Largestprimate
– Knuckle-walk/bipedal• Buildnests-architecturaltools• SocialGroupings• CommunicaGon
– Ritualizedaggression• Intelligence
Gorilla
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Chimps
BonobosChimps
TwodifferentspeciesEasternChimpshaveBonobosgenes
NaturalHistoryIntelligence
Linkedslide5.4.2.3
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HOMININ SPECIES
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ConstrucGonofthemolecularclock
• Comparethesequencedifferencebetweenindividualproteins• Sumdataforallhomologousproteinsfromdifferentspecies• Plotsequencedatavs.Lmeofdivergencedatafromfossilrecord
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Australopithecusanamensis
• Lived4mya– Wetwoodlandnearlake
• ComparetoArdipithecus– retainedape-likecraniaanddenGGon
– advancedhominid-likepostcranial
• Bipedal
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Australopithecusafarensis• Lucy-Fossilrecord
– Sexuallydimorphic• Re-organizedBrain
– parietalcerebralcortex• Enlarged(Homotype)
• Faceprojectsforward– Largecanines– Ape-likedentaGonpabern
• Post-cranial-ape/homo– Femurlong– Forearmsshort– Fingerscurved
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Australopithecusafricanus
• Bipedal-morehuman-like– Iliacbladeshort/wide– SciaGcnotch
• Flaberface– Jawmuscleschange– Smallercanines– Lesssexualdimorphism
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Australopithecusgarhi
• Anatomy– DentaGonpabern
• Largepre-molars
– Human-likelimbproporGons
• Toolmakeranduser• Livedattheedgeoflake,grasslandarea
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HOMO SPECIES
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Homohabilis• AncestralTraits• Derivedtraits• Bipedalability• ClimateChange(2.5mya)• TaxonomicposiGon• AppearenceinEurope
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Homorudolfensis
• Africanorigin1.9Mya• Cranialstructure• TaxonomicPosiGon
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Homoergaster• Africanversionerectus
• Derivedtraits• Differencefromheidelbergensis
• Differencefromerectus• Tooluse• Harnessedfire• Anatomicallycapableoflanguageuse
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Homoerectus
• TaxonomicposiGon• ExpansionoutofAfrica• Tooluse• FireUse• Hunter-GathererSociety
• AncestralHeritage
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H.habilis/H.erectus
Linkedslide17.5.2
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Homoantecessor
– ClassificaGon– EarlyHumanpresenceinEurope
– Physiology– TransiGonfossils
Linkedslide17.6
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Homoheidelbergensis
• Taxonomy– DerivaGon– Gaveriseto
• Tools• Genomeanalysis
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Homoneanderthalensis
• GenomiccomparisontosapiensSharedwithsapiens
Differentfromsapiens
• Morphology• Tooluse• Art• Behavior• ExGncGon
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D Reich et al. Nature 468, 1053-1060 (2010) doi:10.1038/nature09710
Aneighbour-joiningtreebasedonpairwiseautosomalDNAsequencedivergencesforfiveancientandfivepresent-dayhominins.
NeanderthalsCroaGa
NeanderthalCaucus
Kalahari
Nigeria
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Homofloresiensis
• Discovered:islandofFlores(Indonesia)– DeanFalk
• Age:50,000to100,000yearsold.• Nicknamed“hobbit”• Otherdwarfismexamples-Pygmyelephants– Hunted
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Homonaledi
• DaGng236-325kya• DinalediChamber-Burialspot
• Brain–smallbutcomplex
• Anatomy– ancestral– derived
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Supraorbitalforamen
Linkedslide17.4.1
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OutofAfrica
• HumansinGeorgianSteppes1.77yearsago
• Homohabilisorerectus– Smallstatureandbrain
• 650cm3
– WalkedlikeChimps– Mode1toolkit
• HuntedEurasianmammals
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Humangenomes
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ExpansionfromAfricaH.erectus
Linkedslide17..5.1
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Khoi-San
Linkedslide19.1
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Earlyart
Linkedslide39.1
EngravedShell-holenotshown
AbstractDrawing-RedOchre
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NeanderthalArt
Linkedslide39.2
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CaveArt
Linkedslide39.3
RhinoFrance
AurochFrance
HandsIndonesia
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Sculpture
Linkedslide39.4