Natural Selection Storyboard (Snakes)

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Natural Selection Storyboard (Snakes)
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Kuvakäsikirjoitus Teksti

  • Overproduction
  • Variation
  • Competition
  • Two snakes, one poisonous (R) and one not (L), reproduce together. They overproduce because not all their offspring will survive because there are only so many mice to eat.
  • Survival of the Fittest
  • The poisonous phenotype is created by a mutation in a gene, which causes a change in a protein. When the poisonous snake reproduced, it caused variation in its offspring, because it passed the mutated gene on to half of the offspring. Now, half of the offspring are poisonous, and half are not.
  • Differential Reproduction
  • There is a sudden increase in the snakes' predator, birds, and they have learned that the poisonous snakes can kill them, so they start to only eat the non-poisonous snakes. Also, the poisonous snakes can kill their food, mice, much quicker and more easily than the non-poisonous snakes. This leads to competition between the two types of snakes.
  • Changes in the Gene Pool
  • The poisonous snakes are protected from their predators, and are able to catch more food than their non-poisonous counterparts, because they are poisonous. This gives them an advantage. This also results in the non-poisonous snakes dying off, because they are being killed, and cannot catch food. This is a disadvantage. Eventually, the poisonous snakes survive at a higher frequency while the non-poisonous snakes die off because of natural-selection.
  • The surviving snakes reproduce. Most of them are poisonous, so all of their offspring are also poisonous. However, since one non-poisonous snakes survived, it was able to produce more non-poisonous snakes. Over many generations of reproduction, the majority of the population becomes poisonous.
  • Over time, almost all the snakes have evolved to have the poisonous trait, because the non-poisonous trait has gradually died out. The non-poisonous trait still exists but there are very few of those snakes. This is because the poisonous adaptation allows those snakes to survive and reproduce, while the non-poisonous trait makes it hard for those snakes to survive or reproduce.
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