evolution
DESCRIPTION
Theories, Evidences and Patterns of EvolutionTRANSCRIPT
Isabel V. Neri
What is Evolution?
It is the gradual change from one form to another through a period of time.
Lamarck’s Theory
Darwin’s Theory
Lamarck’s Theory Jean Baptist de Lamarck
Lamarck’s Theory
Acquired traits can be inherited
He proposed that:Organisms change as their environment
changes
Darwin’s Theory
Charles Darwin
Darwin’s Theory
Published “Origin of Species” Traveled around the world in the Beagle He proposed that:
Organisms produce more offsprings than the available resources can support
Organisms fight for limited resources like food, territory, and other necessities of life. Only those who survive can produce their own offspring
Variation exists within species. For example, some gorillas have longer arms than others.
Natural Selection - The environment
selects organisms with beneficial traits.
Adaptation
Adaptation
Adaptation
Lamarck vs Darwin
Jean Baptist de Lamarck
Charles Darwin
1809 1859
French Naturalist English Naturalist
Acquired traits can be inherited by an organism
Organism adapts to changes in the environment. Only the fittest organisms survive through natural selection.
EVOLUTION
NATURAL SELECTION
ADAPTATION
EVOLUTION
NATURAL SELECTION
ADAPTATION
Gradual change from one form to another through a period of time
The environment selects organisms with beneficial traits
A form modified to fit a changed environment
Evidences of Evolution
Any preserved part or tissue of an organism that once lived.
FOSSIL
CASTS
MOLDS
IMPRINTS
PETRIFIED FOSSILS
Biochemical Evidences
Indicate that some organisms have similar DNA sequences, which suggest common ancestry
DNA
VARIATION
Divergent Evolution
Convergent Evolution