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Change over Time
Transcript of Change over Time
Similar organisms have more similar DNA than unrelated organisms.
How Does Evolution Happen
Charles Darwin got information from other scientists such as:
Natural Selection in Action
Changes in populations
Darwin's Theory of Natural Selection
Four parts of Natural Selection
Evidence of Changes over Time
Fossils and Fossil record
Study this for the test
Change over Time
adaptation: a characteristic that improves an individual's ability to survive
species: a group of organisms that are related and can mate to produce fertile offspring
evolution: the process in which inherited characteristics within a population change over generations such that new species sometimes arise
The fossil record gives evidence of change over time
Skeletal Structures show similarities in organisms
Trait: A genetically determined characteristic
Selective breeding: The human practice of breeding animals or plants that have certain desired characteristics
Thomas Malthus: Food supply limits populations
Charles Lyell: The earth is much older than previously thought.
2. Inherited Variation
3. Struggle to Survive
4. Successful Reproduction
In Uganda in 1930, 99% of male elephants had tusks. Today 85% of the male elephant have tusks. What happened? Scientist think that hunting is the reason.
the formation of a new species as a result of evolution
part of the population becomes separate from the rest
over many generations, the separated groups may evolve different sets of traits
the two separated groups can no longer interbreed
Generation time: the time between the birth of one generation and the birth of the next generation