Natural Selection

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Natural Selection
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स्टोरीबोर्ड पाठ

  • #1 Overproduction
  • #2 Variation
  • #3 Environment
  • There are too many of one species of jellyfish (offspring) for the environment to support. Because of this, many of these jellyfish will die off before they are old enough to reproduce.
  • #4 Struggle/Competition
  • There are many variations in the offspring of the jellyfish population. These variations can include, differences in color, tentacle length, and/or shape. These trait variations are passed down through the generations, for example; if two jellyfish with genotypes Tt - T representing the dominant long tentacle trait variation and t representing the recessive short tentacle trait variation - were to reproduce, any of their offspring with genotypes TT and Tt would have long tentacles, whereas any other offspring with genotype tt would have short tentacles.
  • #5 Selection
  • In this ocean environment, the jellyfish have one predator, sharks, and one prey, plankton. Jellyfish with the long tentacle trait variation are able to fend off sharks and capture prey (plankton) easier than jellyfish with the short tentacle trait variation.
  • #6 Differential Reproduction
  • Jellyfish compete for food (plankton), mates and not to be eaten by predators (sharks). Jellyfish with the long tentacle trait variation are at an advantage in these competitions, because their long tentacles allow them to reach food and fend off sharks easier than jellyfish with the short tentacle trait variation.
  • This environment is selected for jellyfish with long tentacles (genotypes TT or Tt) and against jellyfish with short tentacles (genotype tt). This is because jellyfish with longer tentacles are able to catch food and sting predators easier than jellyfish with short tentacles (because of their tentacle length).
  • In the first generation of jellyfish, half of the jellyfish have the short tentacle trait variation - represented by tt - and half of them have long tentacle trait variation - represented by TT or Tt - . Then in the second generation, there are two long tentacle jellyfish - one has genotype TT and the other has genotype Tt - and one short tentacle jellyfish (tt), who is eaten by a shark before she can reproduce. This leaves two long tentacle jellyfish to mate in the second generation, creating a third generation in which all jellyfish (offspring) have long tentacles (because they all have genotypes TT or Tt). If the environment remains for long tentacled jellyfish and against short tentacled jellyfish, then in many, many generations, the jellyfish population will have evolved from a mix of short and long tentacled jellyfish into all long tentacled jellyfish.
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