Natural Selection

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The document discusses natural selection and adaptation. It explains that natural selection is the process by which heritable traits that increase an organism's chances of survival and reproduction become more common over generations. It was introduced by Charles Darwin in his 1859 book On the Origin of Species. Examples are given of natural selection in different organisms. Limiting factors like food, space, disease, and others influence population sizes within ecosystems.

Education

Natural Selection and
Adaptation

Monday, April 12, 2010

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.
Monday, April 12, 2010

Often used in conjunction with the
phrase survival of the fittest.
A fit organism is said to have a
reproductive advantage in a
population.

Monday, April 12, 2010

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?

Monday, April 12, 2010

Introduced by Charles Darwin in
his 1859 book On the Origin of
Species.

Monday, April 12, 2010

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.
Monday, April 12, 2010

Examples of natural selection...

Monday, April 12, 2010

Natural Selection has been used
by many scientists to describe the
biodiversity seen on our planet.

Monday, April 12, 2010

It has also been used to explain
speciation (the evolution of new
species of organisms)

Monday, April 12, 2010

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

Monday, April 12, 2010

Symbiosis is the process by which
an organism may coevolve to
interact closely with another organism.

Monday, April 12, 2010

Mutualism results in both organisms
benefiting from the relationship.

Monday, April 12, 2010

Commensalism results in one organism
benefiting and one being unaffected in a
relationship.

Monday, April 12, 2010

Parasitism is a relationship in which one
organism benefits and one is harmed

Monday, April 12, 2010

There are many limiting factors
that influence populations of
organisms in an ecosystem...

Monday, April 12, 2010

There are many limiting factors
that influence populations of
organisms in an ecosystem...

Food

Monday, April 12, 2010

There are many limiting factors
that influence populations of
organisms in an ecosystem...

Food

Predation

Monday, April 12, 2010

There are many limiting factors
that influence populations of
organisms in an ecosystem...

Food

Predation

Disaster

Monday, April 12, 2010

There are many limiting factors
that influence populations of
organisms in an ecosystem...

Food

Predation
Space
Disaster

Monday, April 12, 2010

There are many limiting factors
that influence populations of
organisms in an ecosystem...

Food Sunlight
Predation
Space
Disaster

Monday, April 12, 2010

There are many limiting factors
that influence populations of
organisms in an ecosystem...

Food Sunlight
Predation
Space
Disaster Disease

Monday, April 12, 2010

There are many limiting factors
that influence populations of
organisms in an ecosystem...

Food Sunlight
Shelter
Predation
Space
Disaster Disease

Monday, April 12, 2010

Many other factors may influence
natural selection in an ecosystem...

Monday, April 12, 2010

Many other factors may influence
natural selection in an ecosystem...

Hunting

Monday, April 12, 2010

Many other factors may influence
natural selection in an ecosystem...

Hunting

Pollution
Monday, April 12, 2010

Many other factors may influence
natural selection in an ecosystem...

Hunting

Forest Fires
Pollution
Monday, April 12, 2010

Many other factors may influence
natural selection in an ecosystem...

Hunting

Deforestation
Forest Fires
Pollution
Monday, April 12, 2010

Many other factors may influence
natural selection in an ecosystem...

Hunting Introduction of
new species

Deforestation
Forest Fires
Pollution
Monday, April 12, 2010

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Natural Selection

1. Natural Selection and Adaptation Monday, April 12, 2010

2. 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. Monday, April 12, 2010

3. Often used in conjunction with the phrase survival of the fittest. A fit organism is said to have a reproductive advantage in a population. Monday, April 12, 2010

4. 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? Monday, April 12, 2010

5. Introduced by Charles Darwin in his 1859 book On the Origin of Species. Monday, April 12, 2010

6. Introduced by Charles Darwin in his 1859 book On the Origin of Species. Monday, April 12, 2010

7. Introduced by Charles Darwin in his 1859 book On the Origin of Species. Monday, April 12, 2010

8. 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. Monday, April 12, 2010

9. Examples of natural selection... Monday, April 12, 2010

10. Examples of natural selection... Monday, April 12, 2010

11. Examples of natural selection... Monday, April 12, 2010

12. Examples of natural selection... Monday, April 12, 2010

13. Examples of natural selection... Monday, April 12, 2010

14. Examples of natural selection... Monday, April 12, 2010

15. Examples of natural selection... Monday, April 12, 2010

16. Natural Selection has been used by many scientists to describe the biodiversity seen on our planet. Monday, April 12, 2010

17. It has also been used to explain speciation (the evolution of new species of organisms) Monday, April 12, 2010

18. 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 Monday, April 12, 2010

19. Symbiosis is the process by which an organism may coevolve to interact closely with another organism. Monday, April 12, 2010

20. Mutualism results in both organisms benefiting from the relationship. Monday, April 12, 2010

21. Mutualism results in both organisms benefiting from the relationship. Monday, April 12, 2010

22. Mutualism results in both organisms benefiting from the relationship. Monday, April 12, 2010

23. Mutualism results in both organisms benefiting from the relationship. Monday, April 12, 2010

24. Commensalism results in one organism benefiting and one being unaffected in a relationship. Monday, April 12, 2010

25. Commensalism results in one organism benefiting and one being unaffected in a relationship. Monday, April 12, 2010

26. Commensalism results in one organism benefiting and one being unaffected in a relationship. Monday, April 12, 2010

27. Commensalism results in one organism benefiting and one being unaffected in a relationship. Monday, April 12, 2010

28. Parasitism is a relationship in which one organism benefits and one is harmed Monday, April 12, 2010

29. Parasitism is a relationship in which one organism benefits and one is harmed Monday, April 12, 2010

30. Parasitism is a relationship in which one organism benefits and one is harmed Monday, April 12, 2010

31. Parasitism is a relationship in which one organism benefits and one is harmed Monday, April 12, 2010

32. There are many limiting factors that influence populations of organisms in an ecosystem... Monday, April 12, 2010

33. There are many limiting factors that influence populations of organisms in an ecosystem... Food Monday, April 12, 2010

34. There are many limiting factors that influence populations of organisms in an ecosystem... Food Predation Monday, April 12, 2010

35. There are many limiting factors that influence populations of organisms in an ecosystem... Food Predation Disaster Monday, April 12, 2010

36. There are many limiting factors that influence populations of organisms in an ecosystem... Food Predation Space Disaster Monday, April 12, 2010

37. There are many limiting factors that influence populations of organisms in an ecosystem... Food Sunlight Predation Space Disaster Monday, April 12, 2010

38. There are many limiting factors that influence populations of organisms in an ecosystem... Food Sunlight Predation Space Disaster Disease Monday, April 12, 2010

39. There are many limiting factors that influence populations of organisms in an ecosystem... Food Sunlight Shelter Predation Space Disaster Disease Monday, April 12, 2010

40. Many other factors may influence natural selection in an ecosystem... Monday, April 12, 2010

41. Many other factors may influence natural selection in an ecosystem... Hunting Monday, April 12, 2010

42. Many other factors may influence natural selection in an ecosystem... Hunting Pollution Monday, April 12, 2010

43. Many other factors may influence natural selection in an ecosystem... Hunting Forest Fires Pollution Monday, April 12, 2010

44. Many other factors may influence natural selection in an ecosystem... Hunting Deforestation Forest Fires Pollution Monday, April 12, 2010

45. Many other factors may influence natural selection in an ecosystem... Hunting Introduction of new species Deforestation Forest Fires Pollution Monday, April 12, 2010

Natural Selection

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