Goal 3.05b: Origins and History of Life

Roots:

Endo = withinSym = sameGeo = earthPara = aroundPrim = first

scrapetv.com

Earth formed about 4.6 billion years ago.

Disc. Ed. Begin here and also show “volcanoes, cosmic rain, and extremophiles” http://player.discoveryeducation.com/index.cfm?guidAssetId=DC842144-801C-45DB-8A2A-C4F06F7A8BFC

First forms of LIFE arose 3.5 billion years ago.

trendsupdates.com

msnbc.msn.com

What was Early Earth like?...BAD!!!

Atmosphere:Methane, CO2, water, nitrogen, hydrogen, etc.

No OXYGEN!

Miller and Urey experiment showed that life could have formed out of the simple compounds present during early Earth.

Produced Organic Compounds

commons.wikimedia.org

Proteinoid Microsphere = structure similar to cells

Semipermeable

membrane

Energy Storage!

No DNA or RNA, so NOT cells.

May have evolved into

cells.

biologiateorica.it

PRIMITIVE ORGANISMS!

NO OXYGEN?...NO PROBLEM!ANAEROBIC RESPIRATION

xenotechresearch.com

personal.georgiasouthern.edu

Bacteria capable of photosynthesis emerges.

6CO2 6H2O C6H12O6 6O2sunenergy

+ ++

Oxygen

!

Ozone

Ozone layer trapped theOxygen from photosynthesis and created a new kind of atmosphere.

Many organisms could not adapt to oxygenated air and went extinct. Others evolved into oxygen breathing species.

envis.tropmet.res.in

PHOTOSYNTHESIS!

FYI…This is the hole in our Ozone now.Will we have to evolve or go extinct?

blogs.nature.com

Prokaryotic organisms appeared about 2 billion years ago.

ENDOSYMBIONT Theory

Some prokaryotic cells began evolving internal cell membranes.

Result = primitive eukaryotic cell.

Some prokaryotic cells entered the eukaryotic cells and developed a

symbiotic relationship with the eukaryotic cell.

The inner prokaryotic cells evolved into cell organelles.

Endosymbiont Theory

Sexual Reproduction brought about variation and evolution into modern cells.

virtuallaboratory.colorado.edu

Origins of humankind (interactive)/ Riddle of the Bones (interactive) / Designer Babies? (interactive) http://www.pbs.org/wgbh/evolution/humans/index.html

Tape both of your thumbs to your hands like this…

Perform the following activities as instructed using the materials provided:

1. Open the jar and pour the contents onto your desk.

2. Pick up the penny and place it inside the ziplock bag. Close the bag.

3. Stick the tack into the cardboard then remove it.

4. Write your name in the center of the paper.

5. Now cut your name out of the paper.

6. Paperclip the cut piece of paper (with your name) to the remaining piece of paper.

7. Staple the paper-clipped papers to a sheet of notebook paper.

8. Remove the paperclip and place the stapled papers into the homework box. This will insure you receive an activity grade.

9. Open the door to the work room then close it back gently.

10. Place the tack, the penny and the paper clip into the plastic jar and close it.

You may need a partner to help you tape your thumbs.

clker.com

Speciation = formation of a new species

Behavioral Isolation = isolation due to differences in BEHAVIORS.http://news.nationalgeographic.com/news/2007/02/070221-riflebird-

video.html

Geographic Isolation = isolation due to differences in LOCATIONS.http://bcs.whfreeman.com/thelifewire/content/

chp24/2402002.html

astadnik.wordpress.com

Temporal Isolation = isolation due to differences in SCHEDULES.

Speciation = formation of a new species

Parapatric Speciation = isolation due to differences in

ENVIRONMENTS.

Ligermuleabides.wordpress.com

evolution.berkeley.edu