natural selection
TRANSCRIPT
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Natural Selection and Adaptation
Natural Selection and Adaptation
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Natural selection is the process by which those heritable traits that make it more likely for an organism to survive and successfully reproduce become more common in a population over successive generations.
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Often used in conjunction with the phrase survival of the fittest. A fit organism is said to have a
reproductive advantage in a population.
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Often used in conjunction with the phrase survival of the fittest. A fit organism is said to have a
reproductive advantage in a population.
What happens to an organism that fails to reproduce?
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Introduced by Charles Darwin in his 1859 book On the Origin of Species.
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Introduced by Charles Darwin in his 1859 book On the Origin of Species.
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Introduced by Charles Darwin in his 1859 book On the Origin of Species.
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Introduced by Charles Darwin in his 1859 book On the Origin of Species.
Remember: 1859 was well before the discovery of DNA as hereditary material.
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Examples of natural selection...
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Examples of natural selection...
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Examples of natural selection...
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Examples of natural selection...
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Examples of natural selection...
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Examples of natural selection...
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Examples of natural selection...
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Natural Selection has been used by many scientists to describe the biodiversity seen on our planet.
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It has also been used to explain speciation (the evolution of new species of organisms)
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The radicalism of natural selection lay in its power to dethrone some of the deepest and most tradition comforts of Western thought.
-Stephen Jay Gould
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Symbiosis is the process by which
an organism may coevolve to interact closely with another organism.
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Mutualism results in both organisms
benefiting from the relationship.
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Mutualism results in both organisms
benefiting from the relationship.
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Mutualism results in both organisms
benefiting from the relationship.
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Mutualism results in both organisms
benefiting from the relationship.
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Commensalism results in one organism
benefiting and one being unaffected in a relationship.
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Commensalism results in one organism
benefiting and one being unaffected in a relationship.
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Commensalism results in one organism
benefiting and one being unaffected in a relationship.
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Commensalism results in one organism
benefiting and one being unaffected in a relationship.
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Parasitism is a relationship in which one
organism benefits and one is harmed
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Parasitism is a relationship in which one
organism benefits and one is harmed
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Parasitism is a relationship in which one
organism benefits and one is harmed
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Parasitism is a relationship in which one
organism benefits and one is harmed
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There are many limiting factors that influence populations of organisms in an ecosystem...
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There are many limiting factors that influence populations of organisms in an ecosystem...
Food
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There are many limiting factors that influence populations of organisms in an ecosystem...
Food
Predation
Monday, April 12, 2010
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There are many limiting factors that influence populations of organisms in an ecosystem...
Food
Predation
Disaster
Monday, April 12, 2010
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There are many limiting factors that influence populations of organisms in an ecosystem...
Food
Predation
DisasterSpace
Monday, April 12, 2010
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There are many limiting factors that influence populations of organisms in an ecosystem...
Food
Predation
DisasterSpace
Sunlight
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There are many limiting factors that influence populations of organisms in an ecosystem...
Food
Predation
DisasterSpace
Sunlight
Disease
Monday, April 12, 2010
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There are many limiting factors that influence populations of organisms in an ecosystem...
Food
Predation
DisasterSpace
Sunlight
Disease
Shelter
Monday, April 12, 2010
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Many other factors may influence natural selection in an ecosystem...
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Many other factors may influence natural selection in an ecosystem...
Hunting
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Many other factors may influence natural selection in an ecosystem...
Hunting
PollutionMonday, April 12, 2010
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Many other factors may influence natural selection in an ecosystem...
Hunting
PollutionForest Fires
Monday, April 12, 2010
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Many other factors may influence natural selection in an ecosystem...
Hunting
PollutionForest Fires
Deforestation
Monday, April 12, 2010
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Many other factors may influence natural selection in an ecosystem...
Hunting
PollutionForest Fires
Deforestation
Introduction of new species
Monday, April 12, 2010