Speciation

• Who was Alfred Russel Wallace?

  A scientist who proposed a theory of evolution
• What theory did Alfred Russel Wallace propose?

  A theory of evolution based on natural selection
• What prompted Darwin to publish 'On the Origin of Species'?

  Joint presentation of findings with Wallace
• In what year did Darwin publish 'On the Origin of Species'?

  1859
• Why is Darwin regarded as the discoverer of evolution?

  His book made him famous after publication
• What are the two main contributions of Alfred Russel Wallace?

  • Studying warning coloration in animals
  • Developing the theory of speciation
• What animal did Wallace study regarding warning coloration?

  The Golden Birdwing Butterfly
• What is Wallace's theory of speciation about?

  How new species arise from existing ones
• How did Wallace's contributions compare to Darwin's in the context of evolution?

  Both contributed to the theory of evolution
• How is a species defined?

  A group of genetically similar organisms
• What does speciation mean?

  The formation of a new species
• What happens when populations of the same species become unable to interbreed?

  They are considered different species
• What factors contribute to speciation?

  Isolation and natural selection
• What is isolation in the context of speciation?

  A physical barrier separating populations
• How can a new river or mountain range affect species?

  It can separate populations of a species
• What might differ on either side of a physical barrier?

  Climate or food sources
• How do different environments affect populations on either side of a barrier?

  They experience different selection pressures
• What is the result of different traits becoming more favorable in each population?

  Different characteristics become common
• After many generations, what happens to the two populations?

  They become so different they can't interbreed
• What signifies that speciation has occurred?

  Two populations are separate species
• What are the key processes involved in speciation?

  • Isolation through physical barriers
  • Different environments leading to varied selection pressures
  • Natural selection favoring different traits
  • Long-term genetic, physical, and behavioral divergence