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David Bono-Raftopoulos

Darwin's Theory - 0 views

bioweb.cs.earlham.edu/...theory.html

shared by David Bono-Raftopoulos on 09 Dec 11 - Cached
  • the search for a mechanism of evolution. The first was Jean Lamarck. The second was one of the greatest figures in biology, Charles Darwin.
  • mechanism
  • mechanism
  • ...33 more annotations...
  • Assume that there were salamanders living in some grasslands. Suppose, Lamarck argued, that these salamanders had a hard time walking because their short legs couldn't trample the tall grasses or reach the ground. Suppose that these salamanders began to slither on their bellies to move from place to place. Because they didn't use their legs, the leg muscles wasted away from disuse and the legs thus became small.
  • passed this acquired trait
  • legless salamanders evolved
  • no legs.
  • by inheriting the acquired characteristic of
  • Darwin's Background
  • o have extraordinary talents.
  • genius, did not at first appear
  • Darwin disliked school
  • d observing birds and collecting insects to study.
  • sent to medical school in Scotland
  • "intolerably dull
  • interested in attending natural history lectures.
  • university at Cambridge, England, in 1827.
  • Darwin be chosen for the position of naturalist on the ship the HMS Beagle.
  • to collect specimens, make observations, and keep careful records of anything he observed that he thought significant.
  • Principles of Geology by Charles Lyell,
  • In the Andes he observed fossil shells of marine organisms in rock beds at about 4,300 m.
  • One reason that Darwin was so eager to study life on land was that he suffered from terrible seasickness and couldn't wait to get off the Beagle.
  • thousands
  • trekked hundreds of miles through unmapped region.
  • catalog his specimens and write his notes.
  • praised by the scientific community.
  • experts for study.
  • bird specialist
  • Darwin's bird collections from the Galapagos Islands, located about 1,000 km west of South America.
  • 13 similar
  • Other experts
  • believe that species change over time.
  • evidence f
  • In 1837 Darwin began his first notebook on evolution. For several years Darwin filled his notebooks with facts that could be used to support the theory of evolution.
  • fossils of similar relative ages are more closely related than those of widely different relative ages.
  • He ran his own breeding experiments and also did experiments on seed dispersal.
  • David Bono-Raftopoulos on 09 Dec 11
     
    Very interesting document, it is a credible site, and has multiple pages of information about Darwin's Theory of Evolution. Helped me quite a bit for my TFAD assignment. 
adam unikowski

NOVA | The Four-Winged Dinosaur - 0 views

www.pbs.org/...four-winged-dinosaur.html

nova dinosaur anthropology

shared by adam unikowski on 08 Dec 11 - No Cached
  • n 2002
  • In 2002
  • the 130 million-year-old creature
  • ...13 more annotations...
  • debate over the origin of flight
  • Or were the extra wings useless for flight and likely to have been for some other purpose, such as attracting a mate?
  • Dubbed Microraptor, the crow-sized fossil is one of the smallest dinosaurs ever found
  • Did it array its arm- and leg-mounted wings in the style of an early 20th-century biplane to produce high lift at low speed?
  • Did it use them to create a single lifting surface for efficient, swift gliding?
  • Chinese stone quarry where the fossil was discovered
  • Artists have historically played an important role in paleontology by helping to reconstruct the appearance and behavior of ancient animals.
  • For years the debate has been a standoff between two camps—those who believe dinosaurs were the ancestors of birds, and those who do not.
  • Believers in the dinosaur-bird connection have generally assumed that flight must have begun from the ground up, with fast-running dinosaurs that eventually got airborne as feathered arms evolved into wings,
  • Skeptics of the bird-dinosaur link say it would have been physically impossible for running dinosaurs to overcome gravity and get off the ground.
  • Larry Martin
  • speaks out for the minority view that birds descended from non-dinosaur tree dwellers.
  • Microraptor is the unexpected missing link that has reignited the debate
  • adam unikowski on 08 Dec 11
     
    This very interesting because it shows how people though that birds are decedents of dinosaurs. Then there are the non believers that do not believe that dinosaurs were the ancestors of birds. The four winged dinosaur Microraptor had brought up this debate again. Microraptor is the missing link that reignited this debate. This website is credible because at the bottom of the page it gives the name of the man who made the site and it is part of pbs.
Lauren Ganze

Neanderthals, Humans Interbred-First Solid DNA Evidence - 1 views

news.nationalgeographic.com/...umans-mated-interbred-dna-gene

Neanderthal Human relations DNA shared anthropology evolution

shared by Lauren Ganze on 14 Dec 11 - Cached
    • Lauren Ganze
      Lauren Ganze on 14 Dec 11
       
      did they disappear solely because of other hominid species (humans)?
  • The results showed that Neanderthal DNA is 99.7 percent identical to modern human DNA, versus, for example, 98.8 percent for modern humans and chimps, according to the study.
  • has been found fo
  • ...5 more annotations...
  • Neanderthals, like modern humans, are thought to have arisen on the continent.
  • Though no fossil evidence has been found for Neanderthals and modern humans coexisting in Africa,
  • interbreeding occurred just after our species had left Africa
  • Neanderthals, the study team says, probably mixed with early Homo sapiens just after they'd left Africa but before Homo sapiens split into different ethnic groups and scattered around the globe.
  • 60,000 years ago
adam unikowski

Four-Winged Dinosaurs Found in China, Experts Announce - 0 views

news.nationalgeographic.com/...0121_030122_dromaeosaur.html

nova dinosaurs experts dinosaur anthropology

shared by adam unikowski on 14 Dec 11 - No Cached
  • bipedal carnivorous dinosaurs called theropods
    • adam unikowski
      adam unikowski on 14 Dec 11
       
      The theropod (meaning "beast-footed") dinosaurs are a diverse group of bipedal saurischian dinosaurs. 
  • fully developed, modern feathers on both the forelimbs and hind limbs.
  • new species, Microraptor gui
  • ...7 more annotations...
  • How did a group of ground-dwelling flightless dinosaurs evolve to a feathered animal capable of flying?
  • used its feathered limbs, along with a long, feather-fringed tail, to glide from tree to tree.
  • The six specimens were excavated from the rich fossil beds of Liaoning Province in northeastern China
  • dated at between 128 to 124 million
  • four feathered limbs,
  • birds are most closely related to dromaeosaurids
  • dromaeosaurs were small, feathered animals with forelimbs similar to those of Archaeopteryx, the oldest known bird at around 150 million years old, and feet with features comparable to modern tree-living birds.
Alyssa Cohen

Human Family Tree | The Smithsonian Institution's Human Origins Program - 0 views

humanorigins.si.edu/...human-family-tree

australopithecus family tree human anthropology origins

shared by Alyssa Cohen on 13 Dec 11 - Cached
  • Alyssa Cohen on 13 Dec 11
     
    Interactive 'human family tree' website that simply illustrates the earliest ancestors to today's homo sapiens. 
David Bono-Raftopoulos

Evolution and the Fossil Record by John Pojeta, Jr. and Dale A. Springer - 1 views

www.agiweb.org/...darwinstheory.html

shared by David Bono-Raftopoulos on 14 Dec 11 - No Cached
    • David Bono-Raftopoulos
      David Bono-Raftopoulos on 14 Dec 11
       
      Some cool examples in the second statment
    • Daryl Bambic
      Daryl Bambic on 14 Dec 11
       
      Good work David.  Be ready to explain why this is a credible web site.
  • Competition exists among individuals.
  • The organisms whose variations best fit them to the environment are the ones who are most likely to survive, reproduce, and pass those desirable variations on to the next generation.
  • ...28 more annotations...
  • Competition
  • simple
  • Hair and eye color may be such neutral variations in human beings
  • variations a
  • antelope’s speed m
  • water retention in a desert plant
  • survive to maturity
  • favorable variations
  • passed from generation to generation natural selection.
  • relationship
  • simply by looking at it.
  • “survival of the fittest.”
  • “Fittest” means that organisms must not only survive to adulthood, they must actually reproduce.
  • advantageous genetic variations are passed along and become represented with increasing frequency in succeeding generations.
  • breeding programs.
  • Canis familiaris
  • several discipline
  • The Chihuahua
  • Saint Bernard
  • breeding programs.
  • Artificial selection
  • the same gene pool
  • the ability to interbreed and produce fertile offspring.
  • “man’s best friend.”
  • 20 years
  • natural selection.
  • example,
  • Organisms produce more offspring than the environment can support
Daryl Bambic

Hominid Skull Spurs Radical Rewrite of Human Evolution - D-brief | DiscoverMagazine.com - 0 views

blogs.discovermagazine.com/...cal-rewrite-of-human-evolution

skull fossil species anthro controversy

shared by Daryl Bambic on 20 Oct 13 - No Cached
  • Daryl Bambic on 20 Oct 13
     
    Once again, another discovery challenges the existing scientific theory about the evolution of homo sapiens.
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