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

Scribe Post 11/4

In class today, we discussed the homework due monday, which is:

• UP 3-7
• Spice Lab
• UP 9-11
• UP 15-16B
• Study Mitosis vs. Meiosis

We also filled a good portion of the meiosis notes. These notes are on the moodle page as usual.


Meiosis is the special type of cell division carried out by organisms for sexual reproduction. It produces 4 genetically different cells that are also haploid.

Here are the stages of meiosis:

Prophase I: Here the cells prepare for division just like in mitosis.

Metaphase I: Here the chromosomes line up in the middle and the spindle forms.

Anaphase I: Here the chromosomes split off to the poles.

Telophase I/ Prophase II: 2 Daughter cells are formed, and cytokinesis occurs.

Metaphase II: Chromosomes line up in the middles of their respective cells.

Anaphase II: The DNA splits off to the poles of each cell.

Telophase II: 4 distinct, genetically different cells are formed.

Thank You

Scribe Post 9/12/11 - Biomes

Today we:

• Collected EC Page 62A

• Discussed new homework- UP 65. This is a biome map of the entire globe and a completed version can be found in the textbook on p 429. Some books might not have the map on this page, so look around that area, or use a credible online map.

• For the rest of the class we completed the chart on UP 67-68 and watched short videos that described each type. There were 8 biomes: Tundra, Coniferous Forest, Deciduous Forest, Grasslands, Chaparral, Savannah, Desert, and Tropical Rain Forest.

• Tundra: Long, bitter, cold winters, 0-10 degrees Celsius.
• Less than 25 cm of precipitation a year, mostly snow
• Has permafrost layer- Permanently frozen soil
• Animals include wolves, caribou, polar bears. Snow covered land in winter, but many wildflowers, grasses and small shrubs live in the summer.

• Coniferous Forest: Cold winters, short wet summers
• Precipitation: 35-75 cm. mostly snow
• Soil is nutrient poor and acidic because conifers produce acid
• Wolves, moose, bears, with somewhat large, cone making, needled evergreens

• Deciduous Forest: Cold winters, hot summers: -30 to 30 degrees Celsius

• More precipitation than coniferous, so trees are larger (75-125 cm)
  
• Lots of nutrients because of decomposed leaves
• Cardinals, deer, big, broad leaved trees

• Grasslands: 5 to 22 degrees Celsius

• About as much precipitation as a Coniferous Forest (25-75 cm)
  
• Soil is enriched by glacial deposits and decaying matter- good for farmland
• Hawks, gophers, mostly grass with RARE trees

• Chaparral (Temperate Shrublands): Ocean air provide mild rainy winters, long dry summers

• Precipitation: a little less than grasslands (20-60 cm)
• Periodic fires release nutrients, some seeds only germinate after fires
• Animals mostly the same as Grassland, Spiny shrubs with evergreen leaves

• Savannah: Warm all year

• Precipitation: 120 cm, scattered watering holes
• Lion King animals: Giraffes, Lions, Zebras, etc. Grassy, but drought and fire prevent many trees from growing

• Desert: Warm days, cold nights
  
• Barely any rain
• Scavengers, other specialized creatures, Cacti, sparse shrubs because of little moisture

• Tropical Rain Forest: Along the equator, 25 degrees Celsius
  
• Precipitation: 200 Cm
• Fertile but thin level of good soil
• Extreme biodiversity

This should help if you weren't here for class today. Sorry I couldn't include pics for Desert and Tropical Rain Forest, as the program said the file was to big.

See you in class,

Danny N

Next scribe: Mark