Tuesday, February 7, 2012

Scribe Post 2/6

What happened today:
  • Turned in EC UP 6 or M&M's
  • Bio day this FRIDAY is in our classroom
  • More notes than were previously thought humanly possible


Ch 15

  • origin of universe and earth
  • early earth gases/ atmosphere
  • development of earth
  • Stanley Miller and the Oparin hypothesis- simulated ancient conditions on Earth, many materials needed for life created
  • formation of life
  • the creation of a pre-cell
  • early cell was unicellular, anaerobic, asexual, heterotrophic

Ch. 14

  • Mass Extinction Event describeds
  • sun blocked
  • plants die off
  • plant-eaters die off
  • Macroevolution (2 types: Nonbranching and Branching)

Reproductive Barriers:


  • Temporal Isolation- Time period for mating as a limitation
  • Habitat Isolation- Spatial segregation
  • Behavioral Isolation- Difference in courtship rituals
  • Mechanical Isolation- Anatomically different sexual organs
  • Gametic Isolation- Gametes will not form a zygote


  • Hybrid Inviability: Hybrid offspring die before maturity
  • Hybrid sterility- Hybrid offspring are sterile or infertile

Types of Speciation:

Allopatric Speciation- physical boundaries seperate populations

Sympatric Speciation- populations mixed in location, but unable to breed

Video Links:

Isolation and Speciation- http://www.youtube.com/watch?v=rlfNvoyijmo&noredirect=1

Stanley Miller- http://videos.howstuffworks.com/science-channel/29286-100-greatest-discoveries-origin-of-life-video.htm

Mass Extinction-http://www.youtube.com/watch?v=YlHPspT3pNE

***I was doing this scribe post on a school computer and as such had no speakers. The visuals seemed okay for these videos and that was the best I could do***

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