the descent of man mhs science
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The Descent of Man MHS Science. The History of Biological Sciences. A Little Stroll Through An Odd Assortment of Ideas, Facts, Theories, and Debates Concerning The Descent of Man. Charles Darwin. Buffon. Alfred Russel Wallace. ATTENTION!!!. Georges Cuvier. - PowerPoint PPT PresentationTRANSCRIPT
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The Descent of ManThe Descent of Man
MHS ScienceMHS Science
The History of Biological The History of Biological SciencesSciences
A Little Stroll Through An Odd Assortment of A Little Stroll Through An Odd Assortment of Ideas, Facts, Theories, and Debates Concerning Ideas, Facts, Theories, and Debates Concerning
The Descent of ManThe Descent of Man
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ATTENTION!!ATTENTION!!!!
This is NOT a discussion on evolution and the scientists associated with it. It is simply some of their ideas applied to our species.
Charles Charles DarwinDarwin
Alfred Russel Alfred Russel WallaceWallace
LinnaeusLinnaeus
Thomas Thomas HuxleyHuxley
BuffonBuffon
LamarckLamarck
Georges Cuvier
Charles Charles LyellLyell
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New discoveries are always just around the New discoveries are always just around the corner. As members of an educated public, corner. As members of an educated public,
you will understand and perhaps even you will understand and perhaps even participate in the debate and just as participate in the debate and just as
important, the development of a more important, the development of a more complete comprehension of complete comprehension of Homo sapiensHomo sapiens, , the animal, as well as the animal, as well as Homo sapiens,Homo sapiens, the the
human being.human being.
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ONTOGENY RECAPITULATES PHYLOGENY
The history of the development of an individual organism
Ontogeny
Phylogeny
The evolutionary history of a species; evolutionary relationships of organisms; a “family tree”
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The Mammalian Brain•Large and versatile
•Rely less on genetically programmed instinct
•Adjust more readily to environment - basing behaviour on experience and learning
•The cerebrum (learning center and region of conscious thought) relatively larger
•Corpus callosum has been added
Look at me…I’m a mammal
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Mammalian Points of Mammalian Points of InterestInterestFossil records indicate mammals arose from therapsidstherapsids (197 to 225 million years ago)Three (3) types of mammals:
Placental (uterine embryonic development)
Marsupials (birth immature young - pouch
development)Monotremes (hairy egg layers)
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Tree shrewsTree shrews
TarsiersTarsiers
LemursLemurs
Loris and Loris and PottoPotto
Monkeys - Apes - Monkeys - Apes - HominidsHominids
New WorldNew World Old WorldOld World
CeboideaCeboidea (prehensile tail)
CercopithecoideCercopithecoideaa
Gibbons, Gibbons, Orangutans, Orangutans, Gorillas, Gorillas, Chimpanzees,Chimpanzees,
HominoideaHominoidea
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LemurLemur SifikasSifikas
Chimpanzee
Gorilla
Orangutan
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Chimpanzee Chimpanzee SkeletonSkeleton
Monkey SkeletonMonkey Skeleton
Skull + DentitionSkull + Dentition
Long Bones - Long Bones - RobustRobust
Pelvic GirdlePelvic Girdle
Torso - Torso - Rib CageRib Cage
Femur Femur articulationarticulation
Hands and FeetHands and Feet
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Skeletal Close-Skeletal Close-Up...Up...From trees to From trees to terrestrialterrestrial
Quadruped to BipedQuadruped to Biped
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About 4.4 millions years ago, a different type of primate emerged. Paleontologists classify the first bipedal primates as hominids.
These first hominids had not yet developed the large brain, teeth structure, and skeletal features we identify as Homo. Instead, they predate, and sometimes overlap the first Homo species.
They are known as the Australopithecines.Australopithecines.
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AustralopithecinAustralopithecinesesGracile Australopithecines Robust Australopithecines
Australophithecus afarensis
Australopithecus africanus
Australopithecus robustusAustralopithecus boisei
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Both gracile australopithecines were:1. Small in stature (1 - 1.5 meters)2. Similar brain size/cranial capacity (400 - 500 ml)3. Light body structures
A. afarensis
More ape-like
Predates A. africanus by 1.5 my
Bi/Quadrupedal
A. africanus
Bipedal - musculature is similar to baboons
Found before A. afarensis
I am “Lucy”
And they callme “Taung
child”.
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It is not known how these species directly affected It is not known how these species directly affected human evolution. However, there are many theories:human evolution. However, there are many theories:
A. afarensis
A. africanus
Homo
A. boisei
A. robustus
A. afarensis
A. afarensis
A. boisei
A. africanus
A. robustus
Homo
A. africanus
Common ancestor
Homo
Both robust
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At around two million years ago...
Homo habilis(Evolutionary and technological breakthroughs)
Cranial capacity 600 - 800 ml
First stone tools developed
Habilis means handy-man
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.
At around one million years ago...
Homo erectus(Evolutionary, technological and cultural adaptations)
Cranial capacity 750 - 1250 ml and foreheads begin to develop as a result of a growing frontal lobe (foresight - reasoning - concentration)
H. erectus and H. sapiens practically identical below the neck.
Hand ax, weapons, big-game hunting and the use of fire
Habitual erect posture and efficient bipedal gait
Nothing..
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At around 75 to 30 thousand years ago...
Homo sapiens neanderthalensis
Homo sapiens sapiens
Cranial capacity 1250 - 1750 ml (Neandertal) - sloping forehead
1200 - 1600 ml (Modern humans)
Larger Birth canal and wider pelvic width - longer gestation?
Bones considerably more robust
It is far from easy to put these fellas in their place
No Neandertal traits fall totally outside the variation range of modern humans.
Neandertal variations:
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Cranial Capacities - A Cranial Capacities - A ComparisonComparison
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A Side ViewA Side ViewNote: Note: Temporal Temporal bonebone
Frontal bone Frontal bone (slope)(slope)
Occipital boneOccipital bone
Maxilla and Maxilla and MandibleMandible
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A. africanus
H. habilis
H. erectus
H. sapiens
A Frontal ViewA Frontal ViewNote: Note: Frontal boneFrontal bone
Brow ridgeBrow ridge
Zygomatic archZygomatic arch
MaxillaMaxilla
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A widely accepted theory (to A widely accepted theory (to date)date)
Based on:Based on:Dentition
Skull anatomy
Fossil location
Mitochondrial DNA
Long bone analysis
Pelvic girdle
Radioactive dating
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Evolution: The Human Evolution: The Human AdventureAdventure
Life 3.5 billion years ago
Fossil vertebrate record 500 million years
Placental mammal radiation to the beginnings of the primate order more than 60 m.y.a.
New/Old World divergence 40 m.y.a.
First hominoid 20 m.y.a.
Disputed: 10 - 5 m.y.a. first hominid (human family)
Australopithecus afarensis 5 m.y.a.
The genus Homo emerging 2 m.y.a.
Homo erectus 1 m.y.a.
Homo sapiens sapiens 100 000 - 40 000 years ago
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Hominid evolutionary development has created Hominid evolutionary development has created Homo sapiensHomo sapiens, an animal with behavioural , an animal with behavioural flexibility. But unlike any other organism on this flexibility. But unlike any other organism on this planet we can infinitely mold our own behaviour planet we can infinitely mold our own behaviour through exercise of our own uniquely human through exercise of our own uniquely human creativity.creativity.Does this mean we have left the realm of biological Does this mean we have left the realm of biological evolution?evolution?
No, but our profound ability to modify our No, but our profound ability to modify our environments has outdistanced our biological environments has outdistanced our biological capacity to respond.capacity to respond.
How then can we be expected to How then can we be expected to cope with the new biological cope with the new biological
pressures of the modern pressures of the modern technological world?technological world?
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Clearly, the biggest dangers are the cultural Clearly, the biggest dangers are the cultural ones we have created for ourselves: ones we have created for ourselves: POLLUTION, OVERCROWDING, WAR, POLLUTION, OVERCROWDING, WAR, RESOURCE MISMANAGEMENT, and so forth.RESOURCE MISMANAGEMENT, and so forth.
Equally as clear, the only viable answers Equally as clear, the only viable answers are also cultural ones.are also cultural ones.
As human beings, we possess the As human beings, we possess the capability to remake the world - for capability to remake the world - for
better or worse.better or worse.
The choices are ours.