Theories of the orgin in life Flashcards
God created everything
Divine Theory of Creation
In the 17th century, there has been an argument going on about these two
Abiogenesis vs Biogenesis
generation of bio/life
Word
Genesis
Spontaneous generation
Abiogenesis
Life exists out of nothing
Abiogenesis
This theory has been disapproved
Abiogenesis
JOHN NEEDHAM
Abiogenesis
He experimented through a broth
Spontaneous Generation
John Needham
The microorganisms grew in the broth despite being heated
Spontaneous Generation
John Needham
two reasons why John Needham’s experiment wasproved to be incorrect
Spontaneous Generation
- Boiling point
- Exposure to air
LIFE ORIGINATED FROM PRE-EXISTING LIFE.
Biogenesis
In his experiments, there are 3 jars
Biogenesis
Francesco Redi
there is meat and it is completely exposed, there is air exposure which is why the flies hatched their eggs and maggots grew
Francisco Redi
1st Jar
the jar is closed, so the flies
cannot enter the jar
Francisco Redi
2nd Jar
the jar was sealed with gauze
pad which is why the flies hatched their eggs
in the gauze pad
Francisco Redi
3rd Jar
Disapproved the Spontaneous Generation Theory Due to his experiment with a swan-necked flask
Biogenesis
Louis Pasteur
Three Experiments
Apply Heat, let flask sit, no bacteria present
Louis Pasteur
Step 1
Three Experiments
Apply heat, remove the neck and let it sit
and bacteria made its presence
Louis Pasteur
Step 2
Three Experiments
When he applied heat and tilted the flask
sideways and let it sit, bacteria became
present
Louis Pasteur
Step 3
Theory of Evolution
Other Theories
Charles Darwin
Species change as they
migrated to new environment
Other Theories
George-Louis Buffon
Species change
gradually to adapt to its needs
Other Theories
Jean-Baptiste Lamark
