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Transcript
Artificial Selection Examples Evolution by Natural Selection Essential Question How does evidence support the claim that the process of evolution by natural selection primarily results from 4 factors? Factor 1 • • Organisms must be able to reproduce to increase population size, however… For any species, population sizes would increase exponentially if all individuals that are born survived and reproduced successfully Factor 2 Heritable, genetic variation is due to: ■ Random mutations • • not always bad! ■ Sexual reproduction • think meiosis, Punnett squares • • Traits are inherited by chance Adaptation – an inherited trait that gives you an advantage in the environment Factor 3 • • Resources are limited so organisms must compete for them Resources include: food, water, space/shelter, sunlight (plants), mates Factor 4 • • Organisms with traits better suited to the environment are more likely to survive and reproduce than organisms less suited to the environment Favorable characteristics accumulate over generations Natural Selection Natural Selection Leads To Diversity Click to watch this video clip • 5 Fingers of Evolution
