Anthropology Flashcards
Subfields of physical anthropology
Biological anthropology
Primatology
Forensic anthropology
Subfields of cultural anthropology
Archaeology
Linguistics
Ethnology (studying living cultures)
Charles Darwin’s theory of evolution was based on his study of the diverse groups of _________ found on the Galapagos islands
finches
Because each island had a unique environment, Darwin hypothesized that the finches adapted through the process of _________________
natural selection
T or F: No 2 members of a species are exactly alike
True
Natural selection
Members of a species that survive pass on their unique characteristics to their offspring so that over time, successful variations produce a new species
The peppered moth → light moths blended in with the light-coloured trees, but once the trees were darkened by soot, the dark moths were able to camouflage themselves from predators (e.g. birds), live longer and breed more
Example of natural selection
Does natural selection mean that species are improving?
NO - those best suited to the environment are more likely to survive
K-T extinction event
Dinosaurs and 3/4ths of other species went extinct → temperature and oxygen levels dropped
Dinosaurs vs. Shrews
Dinosaur:
- Large, cold-blooded reptile
- No parenting skills
Shrew:
- Small, warm-blooded mammal with fur
- Care of young
Features humans share w/ primates (name 4)
Opposable thumbs
Large brain
Binocular vision
Dependent offspring
Social nature
Aggressive and territorial
Opposable thumbs allow for _______________ and _______________
fine motor control
use of tools
Binocular vision allows for _______________ and _______________
depth perception
spotting food sources & predators at far distances
Features unique to humans
Bipedalism
Language
An ancient ape-like species whose physical traits represent a transition from ape to human
Australopithecus (A. afarensis)
The jaw of an australopithecus is _________ than that of an ape and it walked _________
upright
Difference between the feet of a chimp and the feet of australopithecus/human
Chimp → grasping foot
Australopithecus/human → bipedal
Australopithecus to homo erectus
2.4 million years ago, a genetic mutation caused ____________ to become weaker
This resulted in smaller ____________________ and gradual recession of the ____________________
jaw muscle
zygomatic arches (cheekbones)
sagittal crest
Smaller jaws (australopithecus to homo erectus) led to an increased in ____________________
cranial capacity (brain size)
Positive impacts of smaller jaw/larger brain (name 3)
- Tool creation
- Language development
- Cooking food
- Weapons for hunting and defence
- Symbolic thought (art, religion, culture)
Negative impacts of smaller jaw/larger brain
Smaller jaw: Inability to process tough foods, more vulnerable to predators
Larger brain: Requires more calories (20% of caloric intake), increases food demand
How did bipedalism lead to a smaller birth canal?
Pelvic bones shifted to provide more stability for upright movement
Positive impacts of bipedalism (name 2)
Can scan horizon to avoid predatory attacks
Frees hands to use tools and transport food
Travel long distances
Obstetrical dilemma
Larger brain + smaller birth canal = pain