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Transcript
What we know now that Darwin didn’t More than 99% of all species that have ever lived are now extinct. New species formed to take their place. HOW??? Speciation- What drives this ‘speciation’? ISOLATING MECHANISMS • Behavioral• Geographical• Temporal- For evolution to take place, something must upset the genetic equilibrium of a population. Hardy- Weinberg Principle The frequency of alleles in a population will remain constant unless one or more factors cause those frequencies to change. In other words… Five conditions required for equilibrium1. 2. 3. 4. 5. Mechanisms of Evolution Directional, Stabilizing, and Disruptive Selection Genetic Drift Patterns of Evolution Adaptive Radiation Convergent Evolution Co-evolution Punctuated Equilibrium Extinction Artificial Selection
