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

Notes:

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:

Prezygotic:

• 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

Postzygotic:

• 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***

Next Scribe:

Dustin