Final Exam! Flashcards
1st step : Genetic variation occurs within populations (through migrations etc)2nd step : Natural selection & other forces of evolution act upon the genetic variation
Two Steps to Evolution
Played some genetic role in our evolution. Can be our direct ancestor or cousin
Hominids
Plio-pleistocene are fossil formsFrom around 6/5 m.y.a to 1 m.y.a
Pleistocene Hominids
A fossil is classified as a hominid if it shows?
Bipedality
We differ from apes in the size of our
BrainApes = 400 - 500 c.c.Humans 1,350 - 1,400 c.c.
- Number of Species2. DNA3. Brain Size4. Sociability5. Language and Facial Expressions6. Diet7. Sex8. Walking Upright9. Eyes10. Tool use
Ape & Human Comparison
Two forms of Australopithecine fossils
Gracile forms = GracefulRobust = Bigger forms
Lucy is from how many m.y.a. ?
3.5 m.y.a.
female Australopithecus afarensis
Lucy
is a form of terrestrial locomotion where an organism moves by means of its two rear limbs or legs. An animal or machine that usually moves in a bipedal manner is known as a biped
Bipedalism
Core
Large semi-hard rock used to create tools
Hammerstone
Large very hard rock used to manipulate the core
flake
slice of rock taken from the core after the hammerstone strikes the it
Biface
A type of prehistoric stone tool flaked on both faces or sides
An absolute dating technique based on the principle of the decay of the radioactive isotope of carbon, used to date archaeological materials within the past 40,000 years
Radiocarbon dating
Homo Habilis
Handy Man East Africa 2.2 m.y.a. - 1.6 m.y.a.
Homo Habilis Brain Size?
600 - 800 c.c.
The Olduwan tools were made by who because of their brain size
Homo Habilis
1.6 m.y.a. to 300,000 years ago
Homo erectus
possessed modern human-like body proportions with relatively elongated legs and shorter arms compared to the size of the torso. These features are considered adaptations to a life lived on the ground, indicating the loss of earlier tree-climbing adaptations, with the ability to walk and possibly run long distances. Compared with earlier fossil humans, note the expanded braincase relative to the size of the face.
Homo erectus
100,000 - 30,000
Homo Sapiens Neanderthalensis
are our closest extinct human relative. Some defining features of their skulls include the large middle part of the face, angled cheek bones, and a huge nose for humidifying and warming cold, dry air. Their bodies were shorter and stockier than ours, another adaptation to living in cold environments. But their brains were just as large as ours and often larger - proportional to their brawnier bodies.
Homo Sapiens Neanderthalensis
The Oldowan is the oldest-known stone tool industry. Dating as far back as 2.5 million years ago, these tools are a major milestone in human evolutionary history: the earliest evidence of cultural behavior. Homo habilis, an ancestor of Homo sapiens, manufactured Oldowan tools.
olduwan pebble choppers
Reports of handaxe discoveries span an area extending from southern Africa to northern Europe and from western Europe to the Indian sub-continent.Acheulean stone tools are the products of Homo erectus, a closer ancestor to modern humans. Not only are the Acheulean tools found over the largest area, but it is also the longest-running industry, lasting for over a million years. The earliest known Acheulean artifacts from Africa have been dated to 1.6 million years ago.
acheulian hand axe