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Evolution Unit

This educational overview delves into Charles Darwin's observations of finches aboard the HMS Beagle, highlighting two significant findings. It outlines the four crucial parts of natural selection with brief explanations for each. The text further discusses important concepts in evolution, such as hypotheses, theories, laws, adaptations, acclimation, and fitness, offering insights into how these elements contribute to the survival and reproduction of organisms in changing environments.

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Evolution Unit

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Presentation Transcript

  1. Warm –up 2/5: • Name two important things that Darwin noticed about the Finches during his travel on the HMS Beagle. • What are the 4 parts of natural selection. • Give a 1 sentence explanation for each. Evolution Unit 15-1 part 2 Notes: Adaptations and Natural Selection

  2. Hypothesis • Testable explanation to a problem or a question

  3. Theory • Summarizes a hypothesis or group of hypotheses that have been supported with repeated testing. • It is valid as long as there is no evidence to dispute it. • EX. Cell Theory and Theory of Continental Drift

  4. Law • Generalizes a body of observations • Laws are the mechanism by which theories act, but they do not describe them • EX. Law of Gravity • EX. Newton’s Law of Motion

  5. Adaptations • A hereditary characteristic that helps an organism survive and reproduce in its environment. • These are long term changes.

  6. Acclimation • Acclimation: A short term physiological change that help and individual survive due to a change in the environment. • A weight lifters muscles acclimate to heavy resistance. • When people live in a cold place their blood thickens to help deal with the cold. • Acclimations are not passed down between generations because they are not genetic. • The ability to acclimate may be genetic.

  7. Fitness • Measure of ability to survive and produce more offspring relative to other members of a population. • The fittest individuals will have the most grandchildren. • The point of fitness is to pass on genetic information.

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