1. 14-3: Origin of Heredity

2. Hypothesis
Testable explanation to a problem or a question

3. Theory
Summarizes a hypothesis or group of hypotheses that have been supported with repeated testing.
It is valid as long as there is no evidence to dispute it.
EX. Cell Theory and Theory of Continental Drift

4. Law Generalizes a body of observations
Laws explain things, but they do not describe them
EX. Law of Gravity

5. First Life Forms Role of RNA
Amino acids linked to make a chain that could make shapes like ribozymes (early ribosome) which could replicate itself

6. First Life Forms - The First Cells
Prokaryotes before eukaryotes
3 major trends all interrelated:
Anaerobic  Aerobic
Heterotrophic  Autotrophic
Chemosynthetic  Photosynthetic

7. First Life Forms The First Eukaryotes
Endosymbiosis Theory
Mitochondria and chloroplasts are thought to be prokaryotic cells that were engulfed by a bigger cell
Supporting Evidence:
Both organelles contain their own DNA
DNA is circular (like other prokaryotes)
Can replicate on their own.

8. Put these in the order in which they are thought to have originated on Earth
Anaerobic heterotrophic prokaryotes
Aerobic eukaryotes
Chemosynthetic prokaryotes
Photosynthetic prokaryotes
Answer: 1, 3, 4, 2

9. Sequence of First Cells
Anaerobic
Heterotrophic
Prokaryotes
Chemosynthetic
Prokaryotes
Photosynthetic
Prokaryotes
Endosymbiosis Occurs Here!
Aerobic
Eukaryotes
Photosynthetic
Eukaryotes

10. Discovery Education-How Life Formed on Earth

11. Class work Read Pages 287-290 Answer Questions 1-5 on page 290
Write out questions or embed in answer.
Draw and label Endosymbiosis on page 290