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Darwin and evolution_part_1 (1)

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M
Mariana Ortiz

Darwin's observations of animals in South America and the Galapagos Islands led him to form ideas about evolution. He noticed that related species on the different islands had adaptations suited to their local environments. This helped Darwin develop his theory of natural selection, where organisms better adapted to their environment are more likely to survive and pass on their traits, leading to evolution over generations as populations adapt to their surrounding conditions.

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Darwin and evolution_part_1 (1)
armadillo sloth mockingbird Giant tortoise finch cormorant hawk
Think about Darwin´s observations and how he began to form ideas of evolution.
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)
The process of Selective Breeding gave Darwin ideas about Evolution
B A
 = Process where individuals with traits beneficial for their environment are more likely to survive  Natural selection causes evolution = change in inherited characteristics of a population (not individuals) from one generation to the next
What happens to the number of green beetles? Why are there only orange beetles?
= populations produce more offspring than can possibly survive
= Every population has variation. Much of this is due to inherited traits.
= In specific environments certain traits are more advantageous and they make the individual more likely to survive (therefore passing on the trait more frequently).
= Over time, traits that improve survival and reproduction become more common.
Darwin and evolution_part_1 (1)

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Darwin and evolution_part_1 (1)

  • 2. armadillo sloth mockingbird Giant tortoise finch cormorant hawk
  • 3. Think about Darwin´s observations and how he began to form ideas of evolution.
  • 4. 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)
  • 5. The process of Selective Breeding gave Darwin ideas about Evolution
  • 6. B A
  • 7. = Process where individuals with traits beneficial for their environment are more likely to survive  Natural selection causes evolution = change in inherited characteristics of a population (not individuals) from one generation to the next
  • 8. What happens to the number of green beetles? Why are there only orange beetles?
  • 9. = populations produce more offspring than can possibly survive
  • 10. = Every population has variation. Much of this is due to inherited traits.
  • 11. = In specific environments certain traits are more advantageous and they make the individual more likely to survive (therefore passing on the trait more frequently).
  • 12. = Over time, traits that improve survival and reproduction become more common.