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N7.12 EVIDENCE FOR THE ORIGIN OF LIFE
1.11: Sc ient i f ic evidence from many di f ferent d isc ipl ines supports models of the or ig in of l i fe .
UNIT 7: POD 4 ORIGIN OF LIFE
UNIT 7: POD 4 ORIGIN OF LIFE
GeologyRadioisotope Dating:
Allows estimates of events during evolutionary history.
UNIT 7: POD 4 ORIGIN OF LIFE
~65 – 70 mya
UNIT 7: POD 4 ORIGIN OF LIFE
Ex. Banded Iron Formations
UNIT 7: POD 4 ORIGIN OF LIFE
Ex. Fossil Fuels
UNIT 7: POD 4 ORIGIN OF LIFE
Miller-Urey Experiments
Simulated “Early Earth” conditions (no O2).
Created Simple Biological Molecules
UNIT 7: POD 4 ORIGIN OF LIFE
Commonalities among all organisms suggests common ancestry.
It is the simplest explanation for the evidence.
DNA Stores Information in all cells on Earth.
UNIT 7: POD 4 ORIGIN OF LIFE
UNIT 7: POD 4 ORIGIN OF LIFE
The Genetic Code is universal in all cells
Glycolysis is universal in all cells
UNIT 7: POD 4 ORIGIN OF LIFE
UNIT 7: POD 4 ORIGIN OF LIFE
All life is organized into cellsThese cells contain fundamental structural similarities
Note: Not to scale.
Prokaryotic Cell:
“Plant-like” eukaryotic cell:“Animal-like” eukaryotic cell:
A Universal Phylogenetic
Tree
UNIT 7: POD 4 ORIGIN OF LIFE
