(7th) Chapter 7-1 Cornell Notes

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Presentation transcript:

(7th) Chapter 7-1 Cornell Notes Darwin’s Theory

Chapter 7-1: Key Questions How did Darwin account for the diversity of species and the differences between similar species? How does natural selection lead to evolution?

Chapter 7-1: Key Terms species- fossil- adaptation- evolution- scientific theory- natural selection- variation- Chapter 7-1: Key Terms

Chapter 7-1 Paragraph 1 1831: Charles Darwin set sail on HMS Beagle; Observations: diversity of organisms/remains of ancient organisms; characteristics of organisms on Galapagos Is; species: group of similar organisms that can mate and have fertile offspring; fossil: preserved remains/traces of organism from the past.

Chapter 7-1 Paragraph 2 1835: noticed plants/organisms on islands similar to mainland; but big differences also; inferred some species came to islands from mainland and changed over time; changes like size/shape of bird beaks on finches; Example of adaptation: trait helps organisms to survive/reproduce; hypothesized some species faced environmental change and developed into new species; evolution: gradual change in species over time; scientific theory: well-tested concept that explains wide range of observations.

Chapter 7-1 Paragraph 3 Darwin wrote “The Origin of Species”; proposed that evolution occurs through natural selection; natural selection: process where better adapted individuals better chance to survive than other members same species; Factors: overproduction; competition; variations; Darwin: natural selection, over a long time, can lead to change; variations important otherwise natural selection would not happen.