Summary of Differences Can Hold Populations Together

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Professors David N. Reznick and Joseph Travis explain different mechanisms of evolution. Using scientific jargon, they discuss recent research studies and the implications of their findings for the scientific community. Using the three-spined stickleback fish as an example, they offer a fascinating lesson about both the biology of organisms and the tools scientists use to test their hypotheses. getAbstract recommends this article to readers interested in the mechanics of evolution.

In this summary, you will learn

  • How different selection forces of evolution work,
  • How scientists conduct experiments to study natural selection and
  • Which conditions may influence the survival of organisms.

About the Authors

David N. Reznick is professor in the Department of Evolution, Ecology and Organismal Biology, University of California. Joseph Travis is professor in the Department of Biological Science, Florida State University.



How does evolution favor body form?

Shells of the snail Cepaea nemoralis take different colors. Brown or pink in populations residing in woodland, yellow in populations residing in meadow. Shell colors matching the background provide camouflage protection from predators. Scientists refer to the adaptation of an organism’s body form to the environment as adaptive evolution. However, because predators predominantly search for the most-common shell color, snails with different colored shells may also survive. This mechanism – called frequency-dependent selection – maintains genetic variation within populations.

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