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The Theory of Evolution. What is the Theory of Evolution?. Theory : well-supported testable explanation of phenomena that have occurred in the natural world Evolution : change over time; process by which modern organisms have descended from ancient organisms. Who is Darwin?.

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what is the theory of evolution
What is the Theory of Evolution?
  • Theory: well-supported testable explanation of phenomena that have occurred in the natural world
  • Evolution: change over time; process by which modern organisms have descended from ancient organisms
who is darwin
Who is Darwin?
  • Charles Darwin is considered the father of modern evolutionary theory
  • Darwin’s 5 year voyage as the naturalist on the HMS Beagle helped him develop the theory of how evolution occurs
darwin presents his case
DarwinPresentsHisCase
  • Through his observations on the Galapagos Islands, he concluded that naturalvariation or differences occur among individuals of a population
  • Scientists later found out that these variations among individuals were caused by mutations
natural selection darwin s main point
Natural Selection(Darwin’s main point)
  • Organisms with more favorable traits or variations tend to survive and reproduce; organisms with less favorable traits are less likely to survive
2 main points of natural selection
2 Main Points of Natural Selection
  • Struggle for existence: competition for territory, food, water, and mates
  • Survival of the fittest: some organisms are better suited to survive in an environment as a result of adaptations (mimicry or camouflage)
evidence for evolution
Evidence for Evolution
  • Fossils: by using fossils, scientists can show the sequence of evolution in an organism
  • Geography: organisms that are similar but live in different parts of the world

Beaver

Muskrat

Beaver andMuskrat

Coypu

Capybara

Coypu andCapybara

evidence for evolution1
Evidence for Evolution
  • Homologous Structures: structures that are similar and seen in different species
      • Ex: forelimbs of humans/bats
evidence for evolution2
Evidence for Evolution
  • Embryology: by studying unborn organisms, we can see structures in common during development in different organisms
slide12
Genetic Relationships: DNA comparisons help establish evolutionary relationships between different species
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