Evolution #2
Updated: 6/4/2020
Evolution #2
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Storyboard Text

  • Ms. Sheperd's grade 11 biology class
  • Darwin came up with the theory of evolution by natural selection. Natural selection is based on the relative reproductive success of individuals within a species due to the individual’s adaptation to the environment. It is a result of change in heritable traits, behavioural or physical.
  • Ms. Sheperd's grade 11 biology class
  • Doesn’t “fittest” mean that only the fastest and strongest should survive? So why are small animals even alive today?
  • Although he did not come up with phrase, Darwin’s theory in his book “On the Origins of Species”, supported the “survival of the fittest”.
  • Survival of the Fittest
  • …No, this is often the misconception with the phrase. The word “fittest” in this context does not refer to an organism’s strength or speed. It means, organisms which are best adapted to their environment will have a greater chance at survival.
  • Survival of the Fittest
  • For example, Giraffes. Their necks did not grow by trying to reach the top of the trees. Instead, the theory is that there were once two types of giraffes. Short necked and long necked. The long necked giraffes survived as they were able to reach the top of the trees for food. Over generations, the short necked giraffes eventually died off as they were not “fit” for the environment.
  • Ms. Sheperd's grade 11 biology class
  • Now I don't want you to think that evolution happens over night or even over a few years. Evolution can range from a few generations to millions of years.
  • Wow! This class is not as boring as I thought it would be.
  • Ms. Sheperd's grade 11 biology class
  • Microevolution, happens below the species and results in small changes within the population. Macroevolution, happens above the species level and results in major changes that can be considered to be a new species.
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