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The Process of Microevolution

The Process of Microevolution. Selection: Directional, Stabilizing, and Disruptive Selection Microevolution vs. Macroevolution Microevolution : change in allele frequency Macroevolution : formation of new species. Microevolution.

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The Process of Microevolution

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  1. The Process of Microevolution Selection: Directional, Stabilizing, and Disruptive Selection Microevolution vs. MacroevolutionMicroevolution: change in allele frequencyMacroevolution: formation of new species

  2. Microevolution The environment selects the best traits in the form of alleles that are advantageous for the given conditions i.e. the ability to digest a new food, or a new skin pigment may allow an organism to blend in with its environment Genotype = genetic make-up, what alleles an organism has Phenotype = appearance, what it looks like

  3. Examples of Microevolution Case 1: English Pepper Moth Case 2: Mystery Predator The common denominator in each of these cases is the change in the alleles of a given gene or set of genes If there is a change in the frequency of the allele(s), then there will be a change in the genotype and phenotype of the population

  4. English Peppered Moth Before industrial revolution After industrial revolution

  5. M and M’s in the wild

  6. The “M and M” Predator • Showing effects of different M & M colors surviving over time

  7. Your turn!Be the chocolate predator… • Empty M and M bag on table. • Place colors on matching dots. • Place colors that don’t match (green) wherever you have space. • Now, EAT your M and M prey that don’t match (easiest to find)

  8. M and M Population-Before Predation

  9. M and M Population-After Predation

  10. Microevolution effects on populations over time Life history patterns = how species reproduce How successful each of the variations in species will be at reproducing Which M and M’s color will likely have a frequency change?

  11. Poor M & Ms!

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