5 Steps of Natural Selection

5 Steps of Natural Selection

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Storyboard Text

  • Starting Population
  • Overprouction
  • Variation & Competition
  • The  turtle species, brown sea turtles, lives on a brown, sandy beach. The turtles are eaten by hungry birds that spot them from above.
  • Adaptation
  •   More juvenile turtles are born than can survive on the beach. There is not enough food or space for all of them to live. Some of the turtles are always spotted by the birds are eaten.
  • Differential Survival
  • Not all of the turtles are brown. Some snails are born with other colors. All of the turtles on the beach are competing to stay hidden from the birds and not get eaten.
  • Differential Reproduction
  • The brightly colored turtles really stand out against the brown, sandy beach. That makes them easy to spot from above. The brown turtles match the color of their environment, making it easier for them to hide.
  • Because their color is an adaptation on the beach, brown turtles are better at avoiding the birds. Brown turtles are eaten less often and survive longer.
  • Only surviving turtles get a chance to reproduce. Because most of those turtles are brown, they pass on their brown color trait to their offspring. Therefore, a greater percentage of turtles are brown in the next generation.
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