Unit 7 Notes: Evolution, Sex, Misconceptions

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Presentation transcript:

Unit 7 Notes: Evolution, Sex, Misconceptions

(1) Vocabulary: Evolution  The change in the types of traits that show up in a population over time. Natural Selection  The survival of better adapted organisms. Adaptation  A trait that increases an organism fitness. Fitness  The ability to survive AND reproduce. Species  Distinct organisms which will not naturally reproduce together.

(2)Why is sex important to evolution? Sex allows a successful organism to pass their “fit traits” on to future generations, and strengthen the success of the population. Think  If successful organisms did not reproduce, would a population survive? No.

(3) What other events can drive evolution? Change to the environment / resources. Migration  When organisms with different traits move into a new population and reproduce. Geographic Isolation  When barriers like land or water separate a population into groups that no longer reproduce together. Genetic Drift  The random “removal” or certain organisms, and their traits, from the population.

(4) Evolution is not… Evolution is not: The extinction of all “old” organisms, and only the survival of “new” and modern day organisms. The changing a population to be more perfect. A linear progression. Evolution IS the change in a population because only some are able to stay alive, and because only some are able to find mates and reproduce.