Updated: 5/3/2019

Storyboard Text

  • How does natural selection lead to adaptation in populations?
  • Environment: Forest Organism: Giraffe Adaptation: Long and Short necks Adaptation Type: Physical
  • Natural Selection leads to evolutionary change when individuals with certain characteristics have a greater survival or reproductive rate than other individuals in a population and pass on these inheritable genetic characteristics to their offspring.
  • This decreases the fitness for the giraffes with short necks because they won't be able to get food from tall trees
  • There are two types of giraffes. There are one's with long necks and others with short necks
  • Long necks giraffes survive longer than the short necked because the long necked giraffes have a higher chance at reproducing because they fight off each other and the loser ends up killed. The short breaded don't get and opportunity to reproduce. The longer neck are also able to reach tall trees to eat while the small necks aren't
  • The longer necks giraffes are surviving more because when fighting off a short necked, the long neck would win the short necked below the ear killing it
  • There will be more necks as the years pass because they are surviving and reproducing more than the short necked giraffes. The genes will be passed on to the next offspring since it is the trait that is living longer
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