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Understanding Natural Selection and Evolutionary Evidence in Biology

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This guide explores the fundamental concepts of natural selection, a key mechanism of evolution. It explains how individuals better adapted to their environment tend to survive and reproduce, passing advantageous traits to the next generation. It includes examples of evolutionary proofs such as the fossil record, extinction events, and embryonic development, and discusses adaptive radiation as a process increasing species diversity. Additionally, it examines homologous and analogous structures in the context of evolution, detailing convergent and divergent evolution.

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Understanding Natural Selection and Evolutionary Evidence in Biology

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  1. SBI3U WARM UP PROOFS of EVOLUTION

  2. SBI3U WARM UP1. Natural Selection is best described as: A) Individuals who are less adapted to their environment survive and pass these traits onto the next generation B) How many offspring an organism has the potential to make C) Individuals who are better adapted to their current environment will survive better and pass their traits on to the next generation D) Survival of the fittest E) Both C and D Can you give an example of natural selection occurring?

  3. 2. Name that Proof!! 1) This proof of evolution pushes back the age of the Earth allowing for a longer period of time for organisms to change: 2) This proof of evolution shows that creatures disappear and appear on the Earth at different times 3) The fact that the backbone is one of the earliest structures to appear in all vertebrates is an example of what proof of evolution? A.Embryonic Development B. Fossil Record C. Extinction

  4. ANSWERS to Name that Proof!! • 1) Fossil Record • 2) Extinction • Why is Extinction proof of evolution by natural selection? • creatures who are not best adapted to their environment will die off. • 3) Embryonic Development

  5. 3. Fill in the blanks! • Adaptive Radiation is an increase in the ___________________ and ______________________ diversity of a species eventually resulting in formation of new ___________ • environmental, social, finches • niches, trait, lizards • morphological, ecological, species • natural selection, trait, species

  6. 4. New species of finches in the Galapagos Islands, and mammal diversity after dinosaur extinction are both examples of _____________________ • A) Organism growth • B) Convergent evolution • C) Adaptive Radiation • D) Divergent evolution • E) Both C and D

  7. 5. Are the following examples of Homologous structures or Analogous structures?

  8. 6. Convergent or Divergent? • Homologous Structures show ____________________ evolution • Analogous Structures show _____________________ evolution • Recall: • convergent evolution: one species evolving into many species • Divergent evolution: many species showing the evolution of a similar trait, but they are not closely related

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