The theory of evolution
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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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The Theory of Evolution

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The theory of evolution

The Theory of Evolution


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


Figure 15 1 darwin s voyage

Figure 15–1 Darwin’s Voyage

Section 15-1


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


Embryology

Embryology


The theory of evolution

  • Genetic Relationships: DNA comparisons help establish evolutionary relationships between different species


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