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Understanding the Differences Between Natural and Artificial Selection

This overview explores the key differences between natural selection and artificial selection. Natural selection, driven by environmental factors, favors organisms with traits that enhance survival and reproduction. In contrast, artificial selection is a process where humans selectively breed organisms based on desirable traits. The concept of homologous and analogous structures also illustrates evolutionary relationships, showcasing how different organisms can share common ancestors or develop similar functions independently. Finally, vestigial structures highlight evolutionary remnants with no current function.

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Understanding the Differences Between Natural and Artificial Selection

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Presentation Transcript

  1. Differences in Evolution

  2. Remember evolution means change over time… Natural Selection Artificial Selection Artificial is selective breeding by humans Humans decides who/what lives or dies based traits they find more desirable They hope its offspring will produce the same traits as well. • Natural is something made by nature • Nature decides the organisms with the best traits to survive and reproduces

  3. Homologous Structures • Homologous structures: structures with different appearances and functions that all derived from the same body part in a common ancestor • The bones in the forelimb of mammals are homologous structures • Different functions, same ancestor structure

  4. Homology of the bones of the forelimb of mammals

  5. Human hand Mole foot Bat wing Fly wing Homologous structures are different than Analogous Structures • Analogous structures have a similar function. • Analogous structures are not evidence of a common ancestor.

  6. Vestigial structures of a whale Vestigial structures • have no apparent function, but resemble structures their ancestors possessed

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