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Evolution

Evolution. Final Thoughts. Thought Experiment. Think about blue-skinned and 6 fingered humans! Is evolution usually observable in one human lifetime?????. Final Point #1: Who evolves?. Evolution refers to a change in a population over time.

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Evolution

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  1. Evolution Final Thoughts

  2. Thought Experiment • Think about blue-skinned and 6 fingered humans! Is evolution usually observable in one human lifetime?????

  3. Final Point #1: Who evolves? Evolution refers to a change in a populationover time. The characteristics of a population can change over time. A population evolves, a population “adapts”, a population changes. An individual either “survives” or “dies”. An individual organism cannot “adapt”; it cannot change the genes (therefore the traits) it inherits. When a population “evolves”, it is because certain individual organisms have perished while other individuals have survived & reproduced.

  4. Final Point #2: Why sex? • Q: Sex requires more energy, special organs, etc,So why bother? • A: Genetic Diversity allows for greater survival chance of population. • Does genetic diversity benefit individual organism or population?

  5. #4: Mutations: Good or Bad? • Mutations are ultimate source of genetic diversity. Sex merely creates new combinations of the alleles (gene forms) which already exist. • Mutations (changes in DNA) generate new alleles. (gene forms) • Are mutations beneficial or detrimental to the species? To the individual organism?

  6. Final Final point! • True – False:The Theory of Evolution is science’s attempt to explain how life originated on Earth.

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