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Population Genetics and evolution

Population Genetics and evolution. Population Genetics and microevolution. Darwin developed his theory of _____________ evolve , not ______________ An organism is born with Evolution occurs as a Gene Pool : Allelic Frequency :

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Population Genetics and evolution

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  1. Population Genetics and evolution

  2. Population Genetics and microevolution • Darwin developed his theory of • _____________evolve, not ______________ • An organism is born with • Evolution occurs as a • Gene Pool: • Allelic Frequency: • A population of organisms in which the allelic frequency remains the same over generations is said to have reached _______________________________

  3. Changes in Genetic Equlibrium • Mutations • . • most • some may • Genetic Drift • change in • affects • is responsible for • Movement of individuals

  4. Genetic Drift and Allelic Frequency

  5. Natural Selection acts on variations • Stabilizing Selection • favors • reduces • Directional Selection • nature • ex: • Disruptive Selection • nature favors • complete opposite of

  6. Evolution of Species (macroevolution) • Speciation: evolution of • Can be caused by: • Geographic Isolation • when a • over time, • Reproductive Isolation (two types) • genetic material • behavioral changes • Change in Chromosomal Number • caused by • polyploid: • results in immediate

  7. Geographic Isolation

  8. How quickly does speciation occur? • 2 Views • Gradualism: • Punctuated Equilibrium: • Biologists tend to agree that both occur depending on the circumstances

  9. Gradualism vs. punctuated equlibrium

  10. Patterns of Evolution • Divergent Evolution • Pattern of evolution • Occurs when Convergent Evolution • Pattern of evolution • Occurs due to • Ex: dolphins and sharks or euphorbs and cacti

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