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Natural Selection
Natural Selection
The title of Darwin's evolutionary biology book in
1859 was:

On the Origin of Species by Means of Natur...
Natural Selection
Darwin suggested that Natural Selection is the
mechanism of evolution.
Think. Pair. Share.
What is happening in this picture?
Natural Selection
Natural selection is the favouring of a trait that is
best suited for survival in its environment.
Natural Selection
These traits arise from mutations.

(Is this real?)
Natural Selection
Many different traits within a species is called
variation, and these variations are heritable.
Natural Selection
Depending on the environment, different traits from
a variety of species are more viable.
Natural Selection
For example:
•There is a population of mice living in a parking lot.
Some are white and some are grey.
•...
Natural Selection
For example:
•Since the grey mice are more difficult to see on the
concrete, white mice will be eaten mo...
Natural Selection
Natural Selection
Which of these mantises are most likely to survive?

... In this desert?
Natural Selection
Which of these cows are most likely to survive?

... In this prairie?
Natural Selection
Which of these butterflies are most likely to survive?

... In this forest?
02b natural selection
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02b natural selection

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Transcript of "02b natural selection"

  1. 1. Natural Selection
  2. 2. Natural Selection The title of Darwin's evolutionary biology book in 1859 was: On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life
  3. 3. Natural Selection Darwin suggested that Natural Selection is the mechanism of evolution.
  4. 4. Think. Pair. Share. What is happening in this picture?
  5. 5. Natural Selection Natural selection is the favouring of a trait that is best suited for survival in its environment.
  6. 6. Natural Selection These traits arise from mutations. (Is this real?)
  7. 7. Natural Selection Many different traits within a species is called variation, and these variations are heritable.
  8. 8. Natural Selection Depending on the environment, different traits from a variety of species are more viable.
  9. 9. Natural Selection For example: •There is a population of mice living in a parking lot. Some are white and some are grey. •When a predator flies over the parking lot, it will eat the first mouse it sees.
  10. 10. Natural Selection For example: •Since the grey mice are more difficult to see on the concrete, white mice will be eaten more often than grey mice. •Nature has selected the grey fur allele for survival in this case. •The white fur allele may eventually die out in the parking lot population.
  11. 11. Natural Selection
  12. 12. Natural Selection Which of these mantises are most likely to survive? ... In this desert?
  13. 13. Natural Selection Which of these cows are most likely to survive? ... In this prairie?
  14. 14. Natural Selection Which of these butterflies are most likely to survive? ... In this forest?

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