Darwin and evolution_part_1 (1)
Transcript of Darwin and evolution_part_1 (1)
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DARWIN AND EVOLUTION
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armadillo
hawk
Giant tortoise
finch
mockingbird
cormorant
sloth
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Read pps. 140-150
Think about Darwin´s observations and how he began to form ideas of evolution.
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READING COMPREHENSION QUESTIONS (COPY IN YOUR NOTEBOOK)
1. What was Darwin´s job on the HMS Beagle? (p.140)
2. Define species (p.141)
3. What observation did Darwin make about animals from South America and those on the Galapagos? (p.142)
4. What reason did Darwin use to explain the differences he saw between the organisms from South America and those on the Galapagos? (p.142)
5. Define adaptation (p.143)
6. Define evolution (p.143)
7. Define natural selection (p.144)8. Explain the difference between overproduction,
competition, variation and selection (pps. 144-145)
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The process of Selective Breeding gave Darwin ideas about Evolution
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DARWIN´S KEY IDEA
vs
Which is more likely to survive?
AB
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NATURAL SELECTION Natural Selection = Process where
individuals with traits beneficial for their environment are more likely to survive
Natural selection causes evolution
EVOLUTION = change in inherited characteristics of a population (not individuals) from one generation to the next
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What happens to the number of green
beetles?
Why are there only orange beetles?
Example of Natural
Selection:
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4 STEPS TO THE THEORY OF EVOLUTION BY NATURAL SELECTION1. Overproduction = populations
produce more offspring than can possibly survive
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4 STEPS TO THE THEORY OF EVOLUTION BY NATURAL SELECTION2. Variation = Every population has
variation. Much of this is due to inherited traits.
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4 STEPS TO THE THEORY OF EVOLUTION BY NATURAL SELECTION3. Selection = In specific environments
certain traits are more advantageous and they make the individual more likely to survive (therefore passing on the trait more frequently).
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4 STEPS TO THE THEORY OF EVOLUTION BY NATURAL SELECTION4. Adaptation = Over time, traits that
improve survival and reproduction become more common.
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Theory of Natural Selection Animation