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Genetic drift & Natural Selection

Mechanisms of Evolution. Genetic drift & Natural Selection. Five Factors Drive Evolution. Mutation. Venom-like proteins first appeared about 200 million years ago. Venoms evolved from other proteins. Venoms were recruited from other functions. I. Natural Selection.

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Genetic drift & Natural Selection

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  1. Mechanisms of Evolution Genetic drift & Natural Selection

  2. Five Factors Drive Evolution • Mutation

  3. Venom-like proteins first appeared about 200 million years ago

  4. Venoms evolved from other proteins

  5. Venoms were recruited from other functions

  6. I. Natural Selection Green mamba is arboreal Its venom is most effective against birds. Black mamba is terrestrial Its venom is most effective against mammals.

  7. OVERPRODUCTION

  8. HERITABLE VARIABILITY

  9. COMPETITION

  10. DIFFERENTIAL REPRODUCTION

  11. II. GENETIC DRIFT • The smaller the population, the less genetic variety it has. • In a very small population, alleles can be lost from one generation to the next, simply by random chance. • When a population evolves only because of this type of random sampling error, GENETIC DRIFTis taking place.

  12. FOUNDER EFFECT

  13. BOTTLENECK EFFECT

  14. AND IN 4.5 BILLION YEARS… • The diversity of life on earth around us evolved.

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