variation and evolution

• differences in characteristics (variation) can be due to genes you have inherited, environmental causes or a combination of both
• We use bar charts to present discontinuous (in distinct groups) variation and histograms for continuous variation
• lamarck believed that:

  • organisms changed because they wanted to survive
  • organisms can never become extinct
  • organisms could decide to change something about their body and pass on that to their offspring
• darwin believed that

  • the was variation in a population
  • certain traits helped organisms survive and reproduce better than those without those certain traits
  • parents are only able to pass on traits that they were born with
• darwin and lamarck believed that

  • organisms have changed over time
  • the environment had something to do with why organisms changed
  • parents are able to pass on at least some of their offspring
  • organisms are still changing
• lamarck's theory of evolution:

  organisms acquire changes during their lifetime. these changes are favourable/make them better. the newly acquired characteristics are passed on to the offspring
• extinction is when there are no remaining individuals of a species still alive