1. Compare radiometric dating and relative dating techniques.
Warm up:
Compare radiometric dating and relative dating techniques.

2. Absolute Dating Relative Dating Exact # Relative Age
Radiometric dating
Isotopes decay
Half life
Relative Age
Relates to age of surrounding layers of rock
Different forms of an element.

3. Get a piece of paper and draw 3 columns.
What I Know…
About the origin of life.
What I want to know…
What I Learned…
(Wait for this part)

4. The Origin of Life Early Ideas
The History of Life
The Origin of Life Early Ideas
Spontaneous generation
idea that life arises from nonlife.
Francesco Redi
tested the idea that flies arose spontaneously from rotting meat.

5. The Origin of Life Early Ideas
The History of Life
The Origin of Life Early Ideas
The theory of biogenesis states that only living organisms can produce other living organisms.
Louis Pasteur designed an experiment to show that biogenesis was true even for microorganisms.

6. The primordial soup hypothesis.
The History of Life
The Origin of Life
Modern Ideas
The primordial soup hypothesis.
Organic molecules could have been synthesized from simple reactions.
UV light from the Sun and electric discharge in lightning might have been the primary energy sources.

7. The History of Life
The Origin of Life
Stanley Miller and Harold Urey showed that simple organic molecules could be made from inorganic compounds.

8. Why are amino acids important?

9. Life requires proteins.
The History of Life
Making Proteins
Life requires proteins.
One possible mechanism for the formation of proteins would be if amino acids were bound to a clay particle.

10. Some RNA sequences appear to have changed very little through time.
The History of Life
Genetic Code
Some RNA sequences appear to have changed very little through time.
Many biologists consider RNA to have been life’s first coding system.

11. Scientists hypothesize that the first cells were prokaryotes.
The History of Life
Cellular Evolution
Scientists hypothesize that the first cells were prokaryotes.
Many scientists think that modern prokaryotes called archaea are the closest relatives of Earth’s first cells.
Archaea also do not need or produce oxygen.

12. The Endosymbiont Theory
The History of Life
The Endosymbiont Theory
The ancestors of eukaryotic cells lived in association with prokaryotic cells.
The relationship between the cells became mutually beneficial, and the prokaryotic symbionts became organelles in eukaryotic cells
This theory explains the origin of chloroplasts and mitochondria.

13. Chapter 14
The History of Life
14.2 The Origin of Life

14. Evolution of Basketball

15. In which type of rock do paleontologists search for fossils?
The History of Life
In which type of rock do paleontologists search
for fossils?
igneous
metamorphic
sedimentary
volcanic

16. At one time people believed that mold growing
The History of Life
At one time people believed that mold growing
on a piece of cheese was created by the
cheese. This is the idea of __________.
biogenesis
transgenesis
primordial generation
spontaneous generation

17. White People are Mutants.

18. National Geographic How life Began