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Evolution

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PRESENTATION OUTLINE

EVIDENCE OF EVOLUTION

BY: DAWSON SMITH, PERIOD 7
Photo by Paul Keller

TOXIN ADAPTATIONS

  • The poison dart frog along time ago was being eaten as food, but as time went on it created toxins in its skin, so when predators later saw this frog they chose not to eat because they know of its toxins. This allowed for the poisin dart frog to thrive and pass down its traits to its offspring.
  • The poison dart frog is located in Central and South America in the rain forrests throughout the continent.

MIMICRY ADAPTATIONS

  • The Viceroy butterfly displays mimicry by looking like the Monarch butterefly which is a toxic species of butterfly. By lloking like the Monarch buttterfly there is a less chance of getting eaten since predators know that Monarchs are toxic, and that they will kill them. This allows the Viceroy butterfly to reproduce in its environment.
  • The Viceroy butterfly is located all over North America.

CAMOUFLAGE ADAPTATIONS

  • The Chameleon is a great exapmle of animal that uses camouflage adaptations. It's camouflage allows it to blend into the environment, to hide from predators. The camouflage also allows him to hunt in his engironment without being seen.
  • Most Chameleon's live in mainland Sub-Saharan Africa and on the island of Madagascar, but they can also be found all over the world. They are found in tropical and mountain rain forests, savannas, and sometimes deserts.

STABILIZING SELECTION

  • Robins in a normal year tend to lay 4 eggs. When they lay more than this though the mother may not be able to provide for all of them, causing some to die. It also happens if they have less than 4 eggs, the baby Robins may not hatch, causing no offspring. This "Stabilizes" the population of Robins.

DISRUPTIVE SLECTION

  • Harbor Seals are a good example of this type of selection. The extreme smaller seals are quicker and more agile, so they can hunt small, quick prey. The extreme larger seals are stronger, so they can hunt larger prey. The average Harbor Seals though struggle because there traits don't specify for any certain hunting style.

DIRECTIONAL SELECTION

  • Directional Selection can best be explained through the Peppered Moths. Before the industrial revolution in England, the lighter colored moths were camouflaged better, so they survived more. When the Industrial Reolution happened though, it caused the environment to change, and now the dark colored moths were camouflaged better and therefore survived more.

SEXUAL SELECTION

  • A female peacock chooses its mate through its appearance and that only. The male peacocks big vibracious tail feathers is the first she chooses, then she checks out your crown feathers, and then she makes sure your call is okay as well.

ARTIFICIAL SELECTION

  • The Australian Shepherd is one of many dog breeds that has been breed for certain traits by humans. The Australian Shepherd was specifically breed though for herding cattle and sheep.

COEVOLUTION

  • An example of coevolution is bees and flowers. Flowers make themselves apealing to male bees, so then bees pollinate the flowers, and then the pollen gets passed from flower to flower.